Answer:
The reaction that takes place is
2Mg + O2 → 2MgO
The mass of MgO produced is 350g.
Explanation:
The heat of vaporization ΔHv of ammonia NH3 is 23.4kJ/mol. Calculate the change in entropy ΔS when 915.g of ammonia condenses at −33.5°C.Be sure your answer contains a unit symbol. Round your answer to 3 significant digits.
Ammonia, or NH3, has a vaporization heat of 23.4 kJ/mol. 915.g of ammonia condenses at 33.5°C, resulting in a 53.832 mol change in entropy, or S.
ΔHvap = 23.4KJ/mol
Mass of NH3 = -915g
T = -33.5° = 239.5k
moles = mass/molar mass = 915 / 17 g/mol
moles = 53.832 mol
Nitrogen and hydrogen combine to generate the inorganic substance ammonia, which has the formula NH3. Ammonia is an odorless gas with a strong unpleasant odor. It is a stable binary hydride and the simplest pnictogen hydride. In terms of biology, it is a typical nitrogenous waste, especially for aquatic animals, and it considerably contributes to the dietary requirements of terrestrial creatures by acting as a precursor to 45% of the world's food and fertilizers[12]. The production of fertilizers [13] in a variety of shapes and compositions, including urea and diammonium phosphate, uses around 70% of ammonia. Also sprayed straight to the soil is ammonia in its purest form.
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In the list at the left are a number of different compounds. Indicate which of them are zwitterions and which are not zwitterions. Clear All (CH3)3N Is a zwitterion HOOCCH2CH2COOH Is not a zwitterion HNCH2Coo
There are numerous distinct compounds listed on the left. List the ones that are zwitterions and those that are not. Zwitter ions are molecules that include two species with opposing charges.
A compound in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion. Chemical connections that are challenging to break are created when the elements interact with one another. These bonds occur as a result by atoms sharing or trading electrons. a material produced by joining two or more distinct elements physically in science. Table salt and water (H2O), that are examples of compounds, are created so when elements oxygen and hydrogen combine.
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the equilibrium constant of a redox reaction can be calculated from the standard reduction potentials of involved redox couples at given temperature.
The Nernst equation and the link between the standard cell potential and free energy can be used to determine the equilibrium constant of the redox process in an electrochemical cell.
The ratio of the product concentration to the reactant concentration is the equilibrium constant. a fixed value for a certain reaction at a specific temperature. The letter "c" denotes the expression of the equilibrium constant in terms of concentrations.
The standard cell potential, temperature, reaction quotient, and the cell potential of an electrochemical cell are all related by the Nernst equation. The Nernst equation can be used to determine the cell potentials of electrochemical cells even under unusual circumstances.
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complete the following table, which lists information about the measured acid dissociation constants of three unknown weak acids.
The table, which lists information about the measured acid dissociation constants of three unknown weak acids is 3,2 and 1 respectively.
Acid [tex]K_{a}[/tex] [tex]pK_{a}[/tex] Relative strength
A 1.6×10⁻¹¹ 10.8 3
B 1.64×10⁻² 1.78 2
C 2.5×10⁻² 1.6 1
Weak acids are acids that do not completely dissociate in solution. In other words, a weak acid is an acid that is not a strong acid. The strength of weak acids depends on the strength with which they dissociate. The more it dissociates, the stronger the acid. HCl is a strong acid because it dissociates almost completely.
KCl is naturally a salt with a strong basic cation and a strong acidic anion neither of which affect pH paper and has a standard value of pH 7.0 being neutral. shape. Vinegar is a combination of acetic acid and water made by a two-step fermentation process.
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when acid is added to the blood buffer system, the in the blood reacts with the from the acid to neutralize it.
When acid is added to the blood buffer system. Overall, the buffer system in the blood plays a vital role in maintaining the pH of the blood and helping to ensure that the body functions properly.
When acid is added to the blood, it can disrupt the balance of acid and base (pH) in the blood. The body has several mechanisms in place to maintain a relatively constant pH in the blood, known as acid-base homeostasis. One of these mechanisms is the buffer system. A buffer system is a solution that helps to maintain the pH of a solution by resisting changes in pH when an acid or base is added. The buffer system in the blood consists of several different components, including bicarbonate, carbonic acid, and hemoglobin. When acid is added to the blood, the bicarbonate ions in the blood react with the hydrogen ions from the acid to form carbonic acid, which can then dissociate into water and carbon dioxide. This reaction helps to neutralize the acid and maintain the pH of the blood. Similarly, when a base is added to the blood, the carbonic acid in the blood reacts with the hydroxide ions from the base to form bicarbonate ions and water, which helps to neutralize the base and maintain the pH of the blood.
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suppose of barium nitrate is dissolved in of a aqueous solution of sodium chromate. calculate the final molarity of nitrate anion in the solution. you can assume the volume of the solution doesn't change when the barium nitrate is dissolved in it. round your answer to significant digits.
Final molarity of NO3- in solution = 0.0193864/0.200= 0.0969 M OR 0.097
Barium nitrate=Barium nitrate is the inorganic compound with the chemical formula Ba(NO₃)₂. It, like most barium salts, is colorless, toxic, and water-soluble. It burns with a green flame and is an oxidizer.
Ba(NO3)2(aq) + Na2CrO4(aq)->2NaNO3(aq) + BaCrO4(s)
Moles of Ba(NO3)2 = mass/molar mass = 1.57/161.97 = 0.0096932
Moles of Na2CrO4 = molarity volume in liters = (44*10^-3)*(200/1000) = 0.0088
From reaction,
1 mole Na2CrO4 requires 1 mole Ba(NO3)2
So, 0.0088 moles will require = 1*0.0088 0.0088 moles of Ba(NO3)2
So, Ba(NO3)2 is excess reagent and Na2CrO4 is limiting reagent.
1 mole Na2CrO4 produces 2 moles NaNO3
So, 0.0088 mole Na2CrO4 will produce = 2*0.0088 0.0176 moles
So, moles of NO3- from NaNO3 (n2) = 0.0176+1 = 0.0176
Total moles of NO3-=n1+n2 = 0.0017864 +0.0176 0.0193864 moles
Volume of solution
= 200 ml = 0.200 liters
Final molarity of NO3- in solution = 0.0193864/0.200= 0.0969 M OR 0.097
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what is the iupac name of the following compound 4 tert butyl 3 chlorophenol 4 tert butyl 5 chlorophenol
the IUPAC name of 4 tert butyl 3 chlorophenol will be given as
3-chloro-4-(1,1-dimethylethyl)phenol.
And the structure for the compound can be given as shown in figure.
IUPAC (International Union of Pure and Applied Chemistry), serves the international scientific endeavor in the dual function of a fundamental science and mission-oriented Union.
Naming according to IUPAC is based on naming a molecule's longest chain of carbons connected via single bonds forming alkane, whether in a continuous chain or in a ring.
All other deviations, either multiple bonds or atoms other than carbon and hydrogen, are indicated by prefixes or suffixes according to a specific set of priorities.
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which of the following compounds contains the most polar bonds? atom (en): h (2.1); s (2.5); p (2.1); as (2.1); cl (3.0); si (1.8); sb (1.9)
The H2O bond is the most polar because the difference in electronegativity between H and O is at its highest.
Since each of the molecules in the set contains hydrogen and another element, the bond that fluorine makes with the hydrogen molecule will be the most polar of the group since fluorine is the most electronegative element in the periodic table. Check each bond's atoms' electronegativity properties. The most polar link will match the difference in electronegativity that is highest. The response is (b) N–H. The short answer is that because nitrogen is one of the most electronegative elements in the periodic table, its bond with hydrogen will be the most polar of all those mentioned.
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A rigid 11.7 L sealed vessel containing 3.3 mol O2(g), 1.6 mol CH4(g) and 2.3 mol of He(g)
has an internal temperature of 78oC.
a. Calculate the partial pressure of each gas.b. What is the total pressure in the vessel?
c. Find the mole fraction of each gas in the vessel.d. A lab technician ignites the mist in the flask and the methane gas combusts in oxygen
to form carbon dioxide and water. Find the mole fraction of each gas in the mixture
after the reaction.
a) Partial pressures is Po2 = 8.13 atm,Pch4=3.94atm,Phe = 5.6 atm,B) Total pressure= 17.73 atm, C) mole fraction are Хо2 =0.46, xch4=0.22, xhe=0.32.
mole fraction are Хo2 =3.3/3.3+ 16 + 2.3,Хо2 =0.46, xch4=0.22, xhe=0.32. Xo2 = no2/no2 + nch4 + nhe, total pressure = 8.13+3.94+5.6=17.73 atm. The pressure applied by a solitary gas in a combination is did refer to as its partial pressure. Presuming we get a combination of ideal gas law, we could use ideal gas equation to resolve issues involving gases inside a mixture. Partial Pressure can be defined as if a canning jar filled with far more than one gas, evey gas enforces pressure. The pressure of any gas enclosed within in the container is regarded to as its partial pressure. The number of molecules of a special component in a mix divided by the total amount of moles in the given medium is symbolised by the mole fraction. It's a means of expressing a solution's concentration.
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If a little bit of lead nitrate gets in contact with a persons eye will it cause serious issues?
Answer:
Explanation:
Lead nitrate can cause serious issues if it comes into contact with a person's eye. Lead nitrate is a toxic chemical that can cause irritation and damage to the eye if it comes into contact with the eye tissue. Symptoms of eye irritation or injury from lead nitrate may include redness, swelling, pain, and blurred vision. If left untreated, lead nitrate exposure to the eye can lead to serious eye damage, including corneal abrasions, conjunctivitis, and even vision loss.
If lead nitrate comes into contact with your eye, it is important to seek medical attention immediately. You should rinse your eye with plenty of water and seek medical attention as soon as possible. Your healthcare provider will be able to determine the extent of the injury and provide appropriate treatment. It is important to follow your healthcare provider's instructions carefully to prevent further injury to your eye.
Can anyone answer this please. All of part 2.
please see picture
Thank you
Answer:
See below for detailed answers to each part of the question.
Explanation:
To solve this problem, we must consider Le Chatelier's Principle, which states the equilibrium position of a system will shift to counteract any changes that occur in the system. This principle can be used to answer each part of your question.
In Part i, we know that N2 is a reactant. Decreasing the concentration of N2 would cause this reaction to shift towards the reactants (to the left), effectively producing more N2 to counteract the change. This would simultaneously decrease the concentration of NH3, since this is a product of the reaction.
Considering the next part, also using Le Chatelier's principle, increasing the pressure would encourage the reaction to shift to decrease the pressure. In order to decrease the pressure, the equilibrium should shift to the side with fewer gas molecules. In this case, there are 4 gas molecules in the reactants and 2 in the products, so the equilibrium position shifts to the products (to the right) to decrease the pressure. This would also increase the amount of NH3, since NH3 is a product.
In Part iii, the temperature is increased. To counteract this change, the reaction will shift to decrease the temperature. Since we know that this reaction is exothermic, the equilibrium will shift towards the reactants (left) to decrease the temperature. This would decrease the amount of NH3.
Finally, in Part IV, if a catalyst is added, this will not change the equilibrium position. Catalysts do not change the overall energy change of a reaction, only the activation energy, so no equilibrium shift will be observed. Thus, the amount of NH3 will not increase/decrease but will remain the same.
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Answer:
I’m struggling with these too! Any help is appreciated
Explanation:
Redox reactions can be predicted because less reactive ions will always receive electrons from metals that are more active.
true or false
False, The metals have been oxidized because they have lost electrons to oxygen; oxidation is hence the loss of electrons.
How do redox reactions take place?The exchange of electrons between an electron donor (which oxidizes) and an electron acceptor occurs in oxidation-reduction or redox processes (that becomes reduced). While reducing agents are quick to give up electrons, oxidizing agents have a high desire for them.
What are redox reactions used for primarily?Because they are the primary sources of energy on this planet, both natural and man-made (or "redox"), oxidation-reduction reactions are significant. Large amounts of energy are typically released when molecules undergo oxidation through the elimination of hydrogen or in conjunction with oxygen.
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Choose the orbital diagram that represents the ground state of n
The ground state orbital configuration of the nitrogen atom is represented by option C
What is the electron configuration?We define the electron configuration of an element as the way and manner in which the electrons that can be found in the atoms of the element are arranged. We have to note that the orbitals that are in the atom are at different energy levels. The orbitals that are closest to the nucleus are the orbitals that are at the lowest energy levels. As we move outwards towards the outermost shells, the energy of the electrons would continue to increase.
The ground state is the lowest energy state of the atom. This is the energy state where the energy of the atom is at its lowest point. The other higher energy states of the atom a re called the excited states of the atom.
The ground state electron configuration of the nitrogen atom is written as; [tex]1s^2 2s^2 2p^3[/tex].
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Arrange these elements according to electron affinity.
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Most energy released by gaining an electron Most energy absorbed by gaining an electron
Answer Bank
He, C F
The arrangement of the elements according to electron affinity is F > C > He.
Electron affinity is the energy released when one electron is added in the outer most shell of the gaseous element.
For moving left to right electron affinity increase because the force of attraction of nucleus on electron increase and size decrease so electron affinity increase.
So F has higher electron affinity because more energy is released after adding the electron.
In carbon electron negativity is less than F so electrons are less strongly attracted by nucleus than F so electron affinity of F > C
In case of He outermost shell is completely filled so electrons are not gained so has minimum electron affinity.
So electron affinity order is F > C > He
More energy released by gaining an electron is F > C > He
More energy absorbed by gaining an electron is He > C > F
So, F > C > He is the energy released by gaining an electron.
He > C > F absorbs more energy by gaining an electron.
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from the plot of vapor pressures vs temperature above, estimate the normal boiling point of carbon disulfide.
The normal boiling point of carbon disulfide from the graph is approximately 46 degrees.
A vapor pressure curve refers to a graph of vapor pressure as a function of temperature. In order to determine the normal boiling point of liquid, a horizontal line is drawn from the y-axis at a pressure equal to standard pressure. Boiling will occur when the vapor pressure is equal to the atmospheric pressure. Hence, the normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one standard atmosphere. The standard atmosphere (atm) is a unit of pressure which is equal to 1013.25 millibars, 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.
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Which one of the following types of radiation has the shortest wavelength, the greatest energy, and the highest frequency? a. Ultraviolet radiation. b. Infrared radiation. c. Visible red light. d. Visible blue light.
Among the given radiations, the one with shortest wavelength, highest energy and highest frequency is ultraviolet radiation.
What is electromagnetic spectrum?Electromagnetic spectrum is the arrangement of different radiations in the order of decreasing wavelength or increasing frequency. The wavelength of an electromagnetic wave is inversely proportional to the frequency and energy.
Thus, as the frequency increases energy of the wave increases and wavelength decreases. The order of waves in the decreasing order of wavelength is, radio waves, microwaves, infrared, visible, ultraviolet, x-ray and gamma ray.
Thus, among the given radiation, the highest energy, highest frequency and shortest wavelength is ultraviolet radiation.
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Guided Practice Activity-use the pen tool to write in the coefficients
to balance the equations then fill in the number of each type of atom
by typing in the number into the fill-in boxes.
1) Determine number of atoms for each
element.
2) Pick an element that is not equal on
both sides of the equation.
3) Add a coefficient in front of the
formula with that element and adjust
your counts.
4) Continue adding coefficients to get the
same number of atoms of each element
on each side.
Mg+0₂ →
2
Mg =
0=
0=
→
8
MgO
Mg =
0=
H₂0₂ H₂0+ 0₂
H=
2
H=
0=
The coefficients in the balanced reaction equations can be seen from the equations;
[tex]2Mg + O_{2} ----- > 2MgO\\2H_{2} O_{2} ----- > 2H_{2} O + O_{2}[/tex]
What is the equation of the reaction?We know that the equation of the reaction is the equation that would show us how the reactants and the products were combined in the reaction. In the equation of the reaction. we notice that the atoms of the reactants would be broken down and then they would be recombined so as to obtain the products of the reaction.
The we know that a universal law that governs the balancing of the reactant equations is that the number of atoms of each of the elements on the reactants side must be equal to the number of the atoms of the elements that we have on the products side.
In the balanced reaction equation, the coefficients can be used to be able to balance the number of atoms.
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Calculate the number of moles of carbon dioxide gas if the volume is 2.0 L, the pressure is 2.0 atm, and the temperatue is 410 K.
Use three significant figures in your answer.
mol
Taking into account the ideal gas law, the number of moles of carbon dioxide is 0.119 moles.
Ideal gas lawAn ideal gas or theoretical gas is a set of separate gaseous molecules separated from each other in such a way that no intermolecular forces are exerted between them.
The ideal gas condition normally occurs at low pressures and high temperatures, which allows each particle to be far from each other so that they do not interact.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
Where:
P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances. The numerical value of R will depend on the units in which the other properties are worked.n is the number of moles of the gas. Number of moles of carbon dioxideIn this case, you know:
P= 2 atmV= 2 LT= 410 KR= 0.082 (atmL)÷(molK)n= ?Replacing in the ideal gas law:
2 atm× 2 L= n×0.082 (atmL)÷(molK)× 410 K
Solving:
[2 atm× 2 L]÷ [0.082 (atmL)÷(molK)× 410 K]= n
0.119 moles= n
Finally, the number of moles is 0.119 moles.
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Calculate the binding energy per nucleon of an Al-27 nucleus given the following masses:Electron= 26.981541 amuProton = 1.007825 amuNeutron = 1.008665 amu
The Binding Energy per Nucleon of an Al -27 nucleus Electron= 26.981541 amu, Proton = 1.007825 amu, Neutron = 1.008665 amu is 8.33 MeV
By dividing the total binding energy of the nucleus by the total number of nucleons, one can calculate the binding energy per nucleon. Mathematically,
Binding energy per nucleon is equal to the sum of all the nucleons.
we know the binding energy can be calculate with formulla:
E= Δmc²
Total binding energy (E) is 931.5 MeV/amu
first we should calculate mass defect (Δm)
Total binding energy (E) is 931.5 MeV/amu
proton = 1.007825 amu
Number of protons in Al-27 = 13
So, the total mass of protons ( mp) = 13.101725 amu
neutron = 1.008665 amu
Number of neutrons in Al-27 = 14
So, the total mass of total neutrons ( mn)= 14.121310 amu
Atomic mass of Al-27 26.981541 amu
Thus, the mass defect can be calculate as follows,
Δm=mp+mn−A
Δm= 0.241492 amu
so the binding energy,
E= Δm X total binding energy
E = 0.241494 amu x 931.5 MeV/amu
E =224.95 MeV
The Binding Energy per Nucleon can be calculate as follows:
Binding Energy per Nucleon = Binding Energy
Total number of nucleons
=224.95 MeV/27
= 8.33 MeV
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Which statement is true? (2 points)
Group of answer choices
Geothermal power plants use the renewable resource of heat from within the Earth to generate electricity.
Solar energy is a non–renewable resource that is used by many countries all over the world.
Oil is a non–renewable resource that is hardly ever used, so there is not a concern of depleting the Earth's supply.
Hydroelectric energy uses the energy from the sun, which is a renewable resource.
Geothermal power plants use the renewable resource of heat from within the Earth to generate electricity is true .
Define geothermal energy.
Deep in the Earth's core, heat is produced that is known as geothermal energy. A clean, sustainable energy source that can be used to generate heat and electricity is geothermal energy.
Rocks, water, gas, and other geological materials are constantly being warmed by heat radiating from the core. Nearby rocks and aquifers underground are heated by magma. Geysers, hot springs, steam vents, submerged hydrothermal vents, and mud pots can all emit hot water. These are all geothermal energy sources.
They can either be directly heated by capturing their heat or by using the steam they produce to produce power. Buildings, parking lots, and sidewalks may all be heated with geothermal energy.
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Why is the nation using more and more renewable energy sources
Renewable energy is more environment friendly.
What are the renewable energy sources?
We know that energy has to do with that which we need for the performance of certain tasks. It is clear that energy is a major driver of the process of development as a lot of the businesses that we do depends on the supply of energy.
We know that getting energy from the non renewable sources is often at a great cost to the environment and that is why the government now tends to focus on the use of energy from the renewable sources.
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a buffer solution: consists of a weak acid in aqueous solution. consists of a mixture of a weak acid and its conjugate base. changes readily in ph upon addition of acid or base. has a ph equal to the pka of the weak acid that's in solution. resists changes in ph upon addition of large amounts of acid or base.
A buffer solution is the consists of a mixture of a weak acid and its conjugate base. it resists changes in pH upon addition of small amounts of acid or base.
The correct option from the given option is , the A buffer solution is the consists of a mixture of a weak acid and its conjugate base. or the weak base and the conjugate acid. A buffer solution resist the the change in pH upon the addition of the small amount of the acid or base to them. the pH of buffer shows the little change when we add very small amount of the strong acid and the strong base.
The buffer solution has the ability to maintain the hydrogen ion concentration with only small amount of dilution with acid or base.
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in the liquid state, which of the following is likely to have the highest surface tension? selected answer: correctd. ch3oh correct answer: correctd. ch3oh
CH3OHCH3OH Only CH3OH, Water has the highest surface tension of the provided liquids among the given molecules because it possesses an intermolecular hydrogen bonding.
Once more, the greater the surface tension of a liquid, the stronger the intermolecular forces of attraction in the liquid. As a result, water has a higher surface tension than methanol. At room temperature, water has one of the greatest surface tensions of any liquid at roughly 72 mN/m. Mercury, a liquid metal with a surface tension of almost 500 mN/m, is the only liquid with a higher surface tension. Take note of the relationship between a liquid's surface tension and the potency of the intermolecular forces: stronger intermolecular forces bonding.
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Which of the following statements is/are true? I. The melting points of molecular solids are lower than those of ionic solids because the bonds ecular solids are weaker than those in ionic solids. II. The shape of molecule does not influence its melting point or boiling point O II only O neither I nor II O I only O both I and II
Both I and II are true statements. The melting point of a solid is the temperature at which solid changes from a solid to a liquid.
Molecular solids are composed of molecules held together by weak intermolecular forces, such as dipole-dipole interactions, hydrogen bonds, and London forces.
These types of bonds are weaker than the ionic bonds that are present in ionic solids, which is why molecular solids have lower melting points than ionic solids.
In addition, the shape of the molecule will influence its melting point or boiling point. For example, molecules with a higher surface area will have a higher boiling point than molecules with a lower surface area.
This is due to the increased surface area leading to increased intermolecular forces and a higher boiling point.
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Both I and II are true statements. The melting point of a solid is the temperature at which solid changes from a solid to a liquid.
Molecular solids are composed of molecules held together by weak intermolecular forces, such as dipole-dipole interactions, hydrogen bonds, and London forces.
These types of bonds are weaker than the ionic bonds that are present in ionic solids, which is why molecular solids have lower melting points than ionic solids.
In addition, the shape of the molecule will influence its melting point or boiling point. For example, molecules with a higher surface area will have a higher boiling point than molecules with a lower surface area.
This is due to the increased surface area leading to increased intermolecular forces and a higher boiling point.
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Which of the following characteristics was NOT included in Dmitri Mendeleev's periodic table?O distribution of elements determined by electron configurationO heavier elements placed in rows closer to the bottom of the tableO elements arranged by increasing atomic massO elements placed in columns based on chemical properties
Mendeleev's periodic table includes all the elements that were known at the time.
The rows of the table, were called periods and each period contained eight elements that increased in atomic mass from left to right.
The columns of the table, called groups, contained elements with similar properties.
The special this about this table was, the gaps for predicted elements were left.
In this question, we are given with four statements and are asked to determine, which of the following statement is not true regarding Dmitri Mendeleev's periodic table.
distribution of elements determined by electron configurationheavier elements placed in rows closer to the bottom of the tableelements arranged by increasing atomic masselements placed in columns based on chemical propertiesOut of these four options, option number 1 is correct as the statement distribution of elements determined by electron configuration is not true regarding Mendeleev's periodic table.
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2 HNO3 + Ca(OH)2 → Ca(NO3)2 + 2 H2O
Given: 151.75 grams H2O produced
Wanted: grams of HNO3 reacted?
The mass (in grams) of HNO₃ that reacted to produce 151.75 grams of H₂O is 531.125 grams
How do I determine the mass of HNO₃ that reacted?We shall consider the balanced equation to obtain usefull information.
2HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2H₂O
Molar mass of HNO₃ = 63 g/molMass of HNO₃ from the balanced equation = 63 × 2 = 126 gMolar mass of H₂O = 18 g/molMass of H₂O from the balanced equation = 2 × 18 = 36 gFrom the balanced equation above,
36 grams of H₂O were produced from 126 grams of HNO₃
With the above information, we can determine the mass of HNO₃ that reacted to produce 151.75 grams of H₂O. Details below:
From the balanced equation above,
36 grams of H₂O were produced from 126 grams of HNO₃
Therefore,
151.75 grams of H₂O will be produce from = (151.75 × 126) / 36 = 531.125 grams of HNO₃
Thus, the mass of HNO₃ that reacted is 531.125 grams
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For the reaction shown, find the limiting reactant for
each of the following initial amounts of reactants.
2 Al (s) + 3 Br2 (g) → 2 AlBr3 (s)
1.0g AL; 1.0g Br2
The limiting reactant in the reaction shown would be [tex]Br_2[/tex].
What are limiting reactants?Limiting reactants are reactants whose availability determines the amount of the product that would be formed. In other words, they are reactants that are available in lower stoichiometric quantities as compared to other reactants in chemical reactions.
In the reaction illustrated:
[tex]2 Al (s) + 3 Br_2 (g) --- > 2 AlBr_3 (s)[/tex]
The mole ratio of the reactants is 2:3.
1.0 g of al = 1/27 = 0.037 mol
1.0 g of [tex]Br_2[/tex] = 1/160 = 0.006 mol
The ratio of Al to [tex]Br_2[/tex] is supposed to be 2:3. But only 0.006 mol of [tex]Br_2[/tex] is available. Thus, this will limit the amount of [tex]AlBr_3[/tex] form.
In other words, the limiting reactant is [tex]Br_2[/tex].
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A retina of a human eye can detect light when radiant energy incident on it is at least 4.0 x 10^-17 J. For light of 600-nm wavelength, how many photons does the correspond to?
The number of photons that are in the light is obtained as 133 photons.
What is the number of the photons?We know that the photons are the particles of light and that we can be able to obtain the energy of the photons. Let us note that the photons also have a given wavelength which can be able to calculate with the formula for the energy of the photon.
An adaptation of the Plank's equation that has to do with the wavelength of the wave can be given by the use of the formula;
E = nhc/λ
E = energy
n = Number of photons
h = Plank's constant
c = Speed of light
λ = wavelength
Then we have;
n = Eλ/hc
n = 4.0 x 10^-17 * 600 * 10^-9/6.6 * 10^-34 * 3 * 10^8
n = 2.4 * 10^-23/1.98 * 10^-25
n = 1.33 * 10^2
n = 133 photons
There are 133 photons present
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which of the following is true regarding the distillation of an water-ethanol (etoh) mixture? correct! etoh distills off first based on boiling point water distills off first based on boiling point etoh and water distill off at the same time in equal proportions water has a lower boiling point than etoh correct! etoh has a lower boiling point than water
The product of the distillation is enriched in the lower boiling liquid, The vapor is a mixture of molecules from all the volatile liquids, The vapor is enriched in the lower boiling component.
Traditional distillation, often known as distillation, is the process of removing specific elements or compounds from a liquid mixture by selectively boiling and condensing them, typically inside a still. Dry distillation, which might involve chemical alterations like destructive distillation or cracking, is the heating of solid materials to produce gaseous products (which may condense into liquids or solids). In either case, the process takes advantage of variations in the relative volatility of the mixture's components. Distillation can produce an almost completely complete separation (resulting in nearly pure components), or it can be a partial separation that boosts the concentration of certain components. Distillation, a physical separation procedure rather than a chemical reaction, is a unit operation of virtually universal importance in industrial applications.
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Before the Contraction CycleThe contraction cycle is the repeating sequence of events that causes the process of the sliding filament mechanism, and it is made up of FOUR phases- The SR releases calcium ions (Ca2+) into the sarcoplasm- There, they bind to troponin. Troponin then moves tropomyosin away from the myosin-binding sites on actin
True. Calcium ions (Ca2+), which are released by the SR, bind to troponin in the sarcoplasm. Then, troponin displaces tropomyosin from the actin myosin-binding sites.
Troponin levels that are extremely high indicate the onset of a heart attack. Within six hours after a heart attack, the majority of individuals experience elevated troponin levels. Mostly everyone who has experienced a cardiac arrest will still have elevated levels after 12 hours. After a heart attack, troponin levels may continue to rise for 1 to 2 weeks. For instance, the typical levels for troponin I is 0 to 0.04 ng/mL, whereas the normal range for rising cardiac troponin (hs-cTn) is less than 14 ng/L. Increases in troponin levels may result from other kinds of heart damage. One of these is sinus arrhythmia.
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