3741.3 J is the total random kinetic energy of all the molecules in one mole of hydrogen at a temperature of 300 k.7482.6 m/s is the speed of a mole of hydrogen have to move so that the kinetic energy of the mass as a whole would be equal to the total random kinetic energy of its molecules
At 300 K, the total random kinetic energy of all the molecules in one mole of hydrogen is 3741.3 J. The speed at which a mole of hydrogen must move in order for its kinetic energy to equal the total random kinetic energy of its molecules is 7482.6 m/s. The average kinetic energy of gas molecules is determined by absolute temperature, according to kinetic theory. At a specific temperature, all gases share the same average kinetic energy". Kinetic energy = 3/2 * RT = 3/2 8.314 * 300 = 3741.3 J,KE = 1/2 m v2,v2 = 2 KE/m = 2* 3741.3/1.
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A buffer solution is prepared that is 0.18 M NH3 and 0.27 M NH4Cl. What is the pH of this buffer? Kb for NH3 is 1.8 x 10-5
The correct answer is: 9.08
Can someone explain how to do this for me?
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of this buffer is 5.14. pH is a unitless quantity.
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
0.18 M =NH₃
0.27 M= NH₄Cl.
Kb of NH₃ = 1.8 × 10⁻⁵
pKb = - log (kb)
= - log (1.8 × 10⁻⁵)
= 4.74
Using Henderson equation
pH = Pkb +ln [ NH₄Cl ]/ [NH₃]
= 4.74 + ln (0.27 /0.18)
= 5.14
Therefore, the pH of this buffer is 5.14.
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If an atom, such as hydrogen, is able to form a covalent bond, describe what happens when the
electron shells of two atoms overlap?
The potential energy between the nuclei is minimized and the orbital shells overlap.
What is a covalent bond?We know that a covalent bond is the kind of bond that is formed when there is the combination of two atoms when there is the overlap of the orbitals of the two atoms. In the case of the hydrogen atoms, we can say that there is a bond as we notice that the two atomic orbitals have become overlapped on each other.
Let us note that when the two atoms are still far from each other, the potential energy between the atoms is high and as such the atoms of the element would tend to repel each other.
As the two atoms begin to approach each other, the repulsion between the nuclei of the elements is seen to become minimized and the bond is now seen to be formed as the atomic orbitals become overlapped.
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Study the diragram below which point is a mid ocean ridge most likely to form can you guys help me
Most likely the mid ocean ridge happens at point A.
What are mid ocean ridges?
A continuous system of underwater volcanoes that encircles the planet like seams on a baseball and stretches for approximately 65,000 kilometres is known as the mid-ocean ridge system (40,390 miles). The system is mostly submerged, with water reaching the top of the ridge on average at a depth of 2,500 meters (8,200 feet).
From the given diagram it can be seen the above description fits in point A
Therefore Most likely the mid ocean ridge happens at point A
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what is the formal charge on phosphorus in a lewis structure for the phosphate ion that satisfies the octet rule?
The formal charge on phosphorus in a lewis structure for the phosphate ion that satisfies the octet rule is 0.
What is a Lewis structure?
All valence electrons are represented by Lewis structures, which are structural formulas for molecules and polyatomic ions. These structural formulas are commonly referred to as Lewis dot structures since valence electrons are frequently shown as dots.
Why is Lewis structure used?
Chemical bonds and atomic structures are examined and understood using Lewis structures. The type of bonds created between atoms using valence electrons or/and lone pairs, as well as the number of bonds an atom can or will form with other atoms, can all be determined using Lewis dot diagrams.
Lewis structure of phosphate (po43-) ion.Formal charge= no. of valence electrons - no. of non bonding valence electrons- [tex]\frac{total no. of bonded electrons }{2}[/tex]
Formal charge of P= 5-0-[tex]\frac{10}{2}[/tex] = 0
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explain the difference in behavior between water and the buffer with addition of acid or base. are your results as expected? why or why?
The adding of an acid or base to a buffer seems to have no effect on the pH of the buffer. In contrast, going to add acid or base to unbuffered water drastically changes the pH.
Any hydrogen-containing substance skilled of making a donation a proton (hydrogen ion) to that other substance is defined as an acid. A base is a compound or ion that really can accept an acid's hydrogen ion. The sour flavours of weak acids is generally described by the contaminant that emits hydrogen ions in water and formation salts by incorporating with these metals. Acids have a bitter aftertaste and cause certain dyes to turn red. buffer is an aqueous solution that withstands adjustments in pH upon on the addition of either an acid or a base". Furthermore, adding water to a buffer or going to allow it to evaporate from of the buffer has no significant effect just on pH of the buffer.
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whats the mass of 7.60×1020 H2O2 molecules
The mass of 7.60 × 10²⁰ hydrogen peroxide molecules is 0.043 grams.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles by the molar mass of the substance as follows:
mass = molar mass × no of moles
However, the number of moles of a substance can be calculated by dividing the number of molecules of a substance by Avogadro's number;
no of moles = 7.60 × 10²⁰ ÷ 6.02 × 10²³
no of moles = 1.26 × 10-³ moles
molar mass of hydrogen peroxide = 34g/mol
mass = 34g/mol × 0.00126 moles
mass = 0.043 grams
Therefore, 0.043 grams is the mass of the hydrogen peroxide.
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what is relative abundance isotopes
The relative abundance of isotopes is the number of atoms of a particular isotope divide by the total number of atoms of all isotopes of that element, multiplied 100 percent.
What is relative abundance isotopes?The relative abundance of an isotope is the percentage of atoms with a specific atomic mass found in a naturally occurring sample of an element.
Also relative abundances refers to the relative proportions of the stable isotopes of each element. They are most often quoted as atom percentages
To calculate the percent abundance of each isotope in a sample of an element, the number of atoms of a particular isotope is usually divide by the total number of atoms of all isotopes of that element and then multiply the result by 100 since it is expressed in percentage.
Mathematically, the formula for relative abundance is given as;
R.A = ( number of atoms of isotope / total number of atoms ) x 100%
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In 25 years, how many observations have been made using the HST?
A. Over 100,00
B. Over 1 million
C. Over 1 billion
The correct answer is Option B
B. Over 1 million
What is 1 Million?
Find the distinction between the international place value system and the Indian place value system first. Afterward, determine the exchange rates between the Indian place value system and the universal place value system. To get the answer, write 1,000,000 in numeric form and convert it to Indian place value.
Finding the value of 1,000,000 and the number that this value of 1,000,000 equates to from the possibilities provided is our task in this question.
We must bear in mind that the worldwide place value system used in this issue is the one that employs millions, billions, etc. This system of place values is not used by us.
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if a sample of magnesium has a mass of 72.9 g, how many moles of magnesium does the sample contain?
Answer:
3 moles
Explanation:
Mg has molar mass of 24.31 g/mol
so 72.9 g / 24.31 g/mo = 3 moles
Draw the Lewis structure for PF3Cl2 in the window below and then answer the questions that follow. What is the electron-pair geometry for P in PF3Cl2 ? What is the the shape (molecular geometry) of PF3Cl2?
Sp[tex]3[/tex] hybridization of a molecule with two lone pairs is present. This molecule's geometry is determined by its electron pair structure. If more than one bond angle is possible, separate each one with a space.
What is hybridization?The process of combining two atomic orbitals to produce a new variety of hybridized orbitals is described as hybridization. Usually, this mixing creates hybrid orbitals with entirely different energies, shapes, and other characteristics. Atomic orbitals with the same energy level are primarily responsible for hybridization. However, if the energies of the orbitals are equal, the process can involve both fully filled and partially filled orbitals. We can better understand bond formation, bond energies, and bond lengths by using the hybridization concept, which is an extension of valence bond theory. During the hybridization process, which primarily entails the merging of two orbitals, two "p" orbitals, or the mixing of a "s" orbital with a "p," the atomic orbitals of comparable energies are mixed together.To learn more about valence bond theory refer to:
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which of the following has the lowest conductivity? a. 0.1 m cuso4 b. 0.1 m koh c. 0.1 m bacl2 d. 0.1 m hf e. 0.1 m hno3
The following has the lowest conductivity are the bacl2 that is 0.1 m as bacl2 is not good electrolyte.
Therefore BaCl2·2H2O is a great selec- tion for growing a polymer electrolyte in addition to for right ionic conductivity results.The molar conductivities at countless dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 S cm2 mol–1 respectively.
BaCl2 can not behavior energy in fused kingdom due to the fact charged debris can not flow in the crystal. BaCL2 is less in conductivity as it has not any of the conductive character and thus cannot definitely says about the conductive.
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select true or false: more energy is required to break a bond with an order of 3/2 than is required to break a bond of order 2.
Answer: The answer is false
Explanation:
Which group of elements shares characteristics with both metals and nonmetals?
a. salts
b. metalloids
c. halogens
d. lanthanides
Answer:
The correct answer is Metalloids
Which of these pairs of elements would be most likely to form a molecular compound?
a.
P and Br
b.
Cu and K
C.
K and O
d.
O and Zn
e.
Al and Rb
Please help with this:
Typically, hard water used in a lab class would have been prepared by adding 1 gram of
magnesium sulfate per liter of distilled water. Magnesium sulfate contains 20.2%
magnesium ions by mass. What is its hardness in grains per gallon (GPG)? (One GPG
equals 17.1 mg/L.)
One grain of calcium carbonate, or 64.8 milligrams, is dissolved in one US gallon of water to represent one grain per gallon (gpg), a measure of water hardness (3.785412 L).
What is Water Hardness Measurement Scales?Understanding your test findings necessitates familiarity with the many water hardness testing scales that are employed. The majority of results are provided as a number that indicates the amount of calcium carbonate or calcium carbonate equivalents present in a specific unit of water. Depending on the measurement method, this value may be given in grains per gallon (gpg), parts per million (ppm), or milligrammes per litre (mg/L).Per Gallon of Grains Measurement of water hardnessThe hardness scale, expressed in gpg of calcium carbonate, can be seen as follows, according to the Water Quality Association:Soft is defined as gpg less than 1.An intermediate level of difficulty is between 1 and 3.5 gpg.The category of fairly challenging ranges from 3.5 to 7 gpg.The hard range is between 7 and 10.5 gpg.It's regarded quite difficult to get above 10.5 gpg.To Learn more About grain per gallon refer to:
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consider the following oxides: so2so2 , y2o3y2o3 , mgomgo , cl2ocl2o , and n2o5n2o5 . how many are expected to form acidic solutions in water?
Nonmetal oxides form acid solutions. SO2, Cl2O, and N2O5 are acid solutions.
A chemical that offers off hydrogen ions in water and paperwork salts through combining with positive metals. Acids have a sour flavor and turn positive dyes purple. a few acids made by using the body, such as gastric acid, can assist organs work the way they must. An example of an acid is hydrochloric acid.
An acidic solution has a high attention of hydrogen ions, H +start superscript, plus, stop superscript, greater than that of pure water. An acidic solution is a liquid combination that happens when hydrogen ions are launched while mixed with water. This definition is known as the Brønsted-Lowry theory: acids provide hydrogen protons, at the same time as bases "accept" hydrogen protons. some answers are more acidic than others.
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Use the diagram to answer the question that follows.
Two different samples of matter are measured in each of these glass containers. Both of
the containers show the same measure for both samples of matter. The samples MOST
likely have which of these in common
If two different samples of matter are measured in each of these glass containers and Both of the containers show the same measure for both samples of matter. They would have same volume in common
What is volume?The space occupied inside an object's borders in three dimensions is referred to as its volume. It is sometimes referred to as the object's capacity.
The capacity of a thing is measured by its volume. For instance, a cup's capacity is stated to be 100 ml if it can hold 100 ml of water in its brim.
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Complete question unfound
You are approached by a neighboring group of human survivors and they are wanting to know what you are shooting at the alien craft so you can see them at night. Choose the right explanation for this effect.
a Chemicals in the paint absorb light energy in a process called phosphorescence, radioactive elements keep the glow going.
b Key element is sulfur and the sulfur creates light after being heated in a process called sulfunescense
c Chlorine is the reason why the alien vessels glow.
d Calcium make the light when the craft comes into contact with water
Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, the correct option is option A.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Chemicals in the paint absorb light energy in a process called phosphorescence, radioactive elements keep the glow going.
Therefore, the correct option is option A.
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what are the correct coefficients if the law of conservation of mass is applied to the decomposition of solid ammonium nitrite to nitrogen gas and liquid water?
Ammonium nitrite, NH4NO2, will decompose to yield nitrogen gas and water Vapor by the following equation:
NH4NO2(s)--->2H2O(g)+N2(g)
A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products. As per law of conservation of mass, the mass of your initial substances (reactants) will be the same as the mass of the substances that you get after the reaction has occurred (products). The mass will stay the same because the number of each kind of atom stays the same. The mass will increase because a new kind of molecule is formed. The principle is that the mass of matter, in a closed system, will always be the same no matter what type of change happens to the matter. Whether it's a change in state, or dissolving, or a chemical reaction, or any combination of these, the amount of mass will not change.
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20.00 g sample of methyl salicylate contains 12.63 g of carbon, 1.06 g of hydrogen, and 6.31 g of oxygen, the empirical formula of methyl salicylate is
20.00 g sample of methyl salicylate contains 12.63 g of carbon, 1.06 g of hydrogen, and 6.31 g of oxygen, the empirical formula of methyl salicylate is C8H803.
The lowest entire number proportion of atoms present in a compound is given by the most straightforward formula as well as empirical formula. This formula indicates the proportion of atoms of each element inside the compound.
The lowest entire number proportion of atoms present in a compound is given by the most straightforward formula as well as empirical formula. This formula indicates the proportion of atoms of each element inside the compound.
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If someone weighs 711 N on Earth, what is that person's
mass?
A. 71.1 kg
B. 70.0 kg
C. 72.6 kg
D. 73.5 kg
Answer:
c.
Explanation:
the closest would be C.
1N = 0.10197 kg
1 kg = 9.81 N
9.81×72.5=711.225
which list contains only strong acids? (5 points) a. hcl, hno3, hf, hclo4 b. h2so4, h3po4, hclo4, nh3 c. hno3, h2so4, naoh, h3po4 d. hcl, hno3, h3po4, hclo4 e. hcl, h2so4, hclo4, hi
a. hcl, hno3, hf, hclo4 b. h2so4 list contains only strong acids.
Chloric acid, hydrochloric acid, hydrochloric acid, hydroiodic acid, nitric acid, perchloric acid, and sulfuric acid are the 7 main acids. These are strong acids since they can completely dissociate in water. A strong acid is described as an acetone that completely disintegrates when added to water. Because the hydrochloric acid inside the preceding example donates every one of its protons to the remedy and totally dissolves, it is classified as a strong acid.
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ammonium ion (nh4 ) is an acid that can dissociate to form ammonia (nh3) and h in aqueous solution. the pka for this reaction is 9.25. when total ammonium ion is 50% dissociated, what is the ph?
When total ammonium ion is 50% dissociated, The pH is 9.25.
Given, the pKₐ of ammonium ion (NH₄⁺) is 9.25.
The dissociation of NH₄⁺ to ammonia (NH₃) and H⁺ in aqueous solution is represented below.
It is stated that the ammonium ion is 50% dissociated in the solution. Therefore the concentration of each species at that instant [if started with 1M conc. of NH4+ (aq)] is summarized as follows:
NH4+ (aq) ⇌ NH3 (aq) + H+ (aq)
Initial conc. (in M) 1 - -
At 50% dissociation 1-0.5, i.e., 0.5 0.5 0.5
The given value of pKₐ immediately reminds us of the form of Henderson-Hasselbalch equation containing pKₐ , i.e.,
pH = pKₐ + log₁₀ [tex]\frac{[salt]}{[acid]}[/tex] _ _ _(i)
But, NH₄⁺ (aq) exists as the conjugate acid form, as well as the salt (ionized) form. Hence, we cannot use equation. (i) for our calculations.
Therefore, we need to convert the above value of Kₐ to the equivalent Kb (for NH₃), corresponding to the reverse equilibrium.
This is achieved by using the relation
Kb = [tex]\frac{Kw}{Ka}[/tex]
or, -log₁₀ Kb = -log₁₀ Kw + log₁₀ Ka
or, pKb = pKw - pKa = 14 - 9.25 = 4.75
where, pKw = 1 x 10⁻¹⁴ (at 298 K).
Therefore, pKb of ammonia (NH₃) = 4.75
Now, we need to use the form of Henderson-Hasselbalch equation which uses Kb; which is in fact
pOH = pKb + log₁₀ [tex]\frac{[salt]}{[base]}[/tex] _ _ _(ii)
where the salt is NH₄⁺, and the base is NH₃. Further, we know that
Kw = [H⁺][OH⁻] or, pOH + pH = pKw = 14 or, pOH = 14 - pH
Substituting this relation in eq. (ii) gives
14 - pH = pKb + log₁₀ [tex]\frac{[NH4+]}{[NH3]}[/tex]
or, pH = 14 - pKb — log₁₀ [tex]\frac{[NH4+]}{[NH3]}[/tex]
As calculated, pKb = 4.75, [NH₄⁺] = 0.50 M, while [NH₃] = 0.50 M, assuming we start with a conc. of 1M NH₄⁺. Hence,
pH = 14 – 4.75 – log₁₀ [tex]\frac{0.50}{0.50}[/tex]
= 9.25 - log₁₀ ( 1 )
= 9.25 - 0
pH = 9.25
Hence, the pH of a solution consisting of 50% NH₃ and 50% NH₄⁺ will be equal to 9.25.
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calculate the standard gibbs free energy associated with the formation of ammonia from nitrogen and hydrogen at 25 c and 500 c
-23.4kj is the standard gibbs free energy associated with the formation of ammonia from nitrogen and hydrogen at 25 c and 500 c
-
The temperature is 25 deg C or 298 K.
ΔGo =−RTlnK=−8.314×298×ln1.3×104 =−23469J=−23.4kJ
Hence, the standard free energy change is -23.4 kJ
Gibbs free energy, thermodynamics The word "free energy" refers to a thermal potential that can be utilized to determine the maximal amount of work that a thermodynamically closed system can perform at constant pressure and temperature. The change in limitless energy that occurs when a chemical is created from its components in their most thermodynamically states under appropriate conditions is referred to as the free basic energy of formation. Ammonia is a colourless gas that has a strong suffocating odour. It easily dissolves in the water, forming an ammonium hypochlorite that can cause discomfort and burns. Under pressure, ammonia gas compresses easily and formation a clear, colourless liquid.
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the epicardial fat pad . a. can be mistaken for a pericardial effusion b. appears heteroechoic and moves with the heart c. is always visible in all cardiac views d. all of the above e. a and b onl
The epicardial fat pad . a. can be mistaken for a pericardial effusion b. appears heteroechoic and moves with the heart.
It is the posterior fat pad that is a sign that indicates a pathology when one looks at an x-ray. When a crescent fat is observed in the x-ray, it indicates there is an elbow joint effusion since normally the posterior fat cannot be seen from the x-ray.
In radiography, X-rays are used to view inner parts of the body for medical observation, analysis and to know the treatment procedure to adopt.
When a non visible posterior fat pad on a well-exposed, then it generally suggests a negative study for injury. This means that the features observed are unrelated to any type of injury. This eliminates option c.
Therefore, only option a and b are correct that the epicardial fat pad . a. can be mistaken for a pericardial effusion b. appears heteroechoic and moves with the heart.
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Walter White cooked 20 pounds of methamphetamine. Gustavo Fring wants to know how much will he earn from this batch. He asks Jesse Pinkman to calculate the total profit he will make. Each pound of methamphetamine costs $4500. How much will Mista White make from this batch?
Answer:
TOTAL: $90000
Explanation:
If the density of solid chromium is 7.15 g/cm3 , what is the packing efficiency of Cr if it adopts a body‑centered cubic unit cell? The molar mass of Cr is 51.996 g/mol .
The packing efficiency of Chromium atom is 68.8 %.
What is the volume of the Chromium atom?
The volume of the chromium atom is calculated by applying the following equation.
V = M / ρ
where;
M is the molar mass of the Chromium atomρ is the density of the Chromium atomV = ( 51.996 g ) / ( 7.15 g/cm³)
V = 7.27 cm³
The radius of the atom for a body‑centered cubic unit cell is calculated as follows;
V = (2) x (4/3 πr³)
V = (8πr³)/3
8πr³ = 3V
r³ = 3V / 8π
r = (3V / 8π)^¹/₃
r = (3 x 7.27 / 8π)^¹/₃
r = 0.95 cm
The volume of the unit cell is calculated as;
Vc = (4r/√3)³
Vc = (4 x 0.95 / √3)³
Vc = 10.56 cm³
The packing efficiency of Chromium atom is calculated as;
= volume of the atom / volume of unit cell x 100%
= (7.27 cm³ / 10.56 cm³) x 100%
= 68.8 %
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ip the electron in a hydrogen atom with an energy of -0.544 ev is in a subshell with 18 states. part a what is the principal quantum number, n, for this atom?
The principle quantum number(n) for this atom is 5
The position in an atom's shells and the size of an electron orbital are described by the primary quantum number, which is the most significant. The quantum number connected to the angular momentum of an atomic electron is called the azimuthal quantum number.
The energy of the electron in a hydrogen atom [tex]E_{n} = -0.544eV[/tex]
For hydrogen, Z = 1
The principal quantum number for [tex]n[/tex] for this atom is calculated by for this atom is determined using Bohr's atomic model,
So that [tex]E_{n} = \frac{-13.6(Z)^{2}}{n^{2}}eVatom^{-1}[/tex]
Where [tex]n[/tex] is the principal quantum number, [tex]E[/tex] is the energy, and [tex]Z[/tex] is the atomic number The values are substituted,
=> [tex]-0.544eV = -\frac{13.6(1)^{2}}{n^{2}} eVatom^{-1}[/tex]
[tex]n^{2} = -\frac{13.6}{-0.544} \\n^{2} = 25\\n = 5[/tex]
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How many grams of nitrogen gas are needed to completely react with 2.8 moles of hydrogen?
The amount of grams of nitrogen gas needed to completely react with 2.8 moles of hydrogen is 26.13 grams.
How to calculate mass?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, nitrogen gas completely reacts with 2.8 moles of hydrogen as follows:
N₂ + 3H₂ → 2NH₃
Based on the above equation, 1 mole of nitrogen gas reacts with 3 moles of hydrogen. This means that 2.8/3 moles = 0.933 moles of nitrogen will react with 2.8 moles of hydrogen.
moles = mass ÷ molar mass
mass = 0.933 moles × 28 = 26.13g
Therefore, 26.13 grams of nitrogen gas is required to react completely.
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methylhydrazine (ch6n2) is commonly used as a liquid rocket fuel. when 4.00 g of methylhydrazine is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00 oc to 39.05 oc. in a separate experiment the heat capacity of the calorimeter is measured to be 7.794 kj/oc. what is the heat of reaction for the combustion of a mole of ch6n2 in this calorimeter?
The heat of reaction for the combustion of a mole of C₆NH₂ in this calorimeter is - 1.30 × 10³ kJ/mol.
The reaction is given as :
2CH6N2(l) + 5O2(g) ----> 2N2(g) + 2CO2(g) + 6H2O(l)
given that :
initial temperature = 25 °C
final temperature = 39.05 °C
heat capacity of the calorimeter = 7.794 kJ/°C
mass of methylhydrazine = 4 g
molar mass of methylhydrazine = 46.1 g/mol
the heat of reaction Q = - C ΔT
= - 7.794 × ( 39.05 - 25)
= - 113.0 kJ
the heat of reaction of a mole = - (113.0 kJ / 4) × 46.1
= - 1.30 × 10³ kJ/mol
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