Answer:
3.52
Explanation:
-log(3 x 10^-4) = 3.52
What is the volume of a 0.25 M MgCl2 solution that contains 0.75 moles of MgCl2?
Answer:
The volume of the solution is 3 L.
Explanation:
Molarity is a measure of the concentration of that substance that indicates the number of moles per unit volume. In other words, molarity is the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.
[tex]Molarity=\frac{number of moles of solute}{solution}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}=M[/tex]
In this case:
Molarity= 0.25 Mnumber of moles of solute= 0.75 molesvolume= ?Replacing in the definition of molarity:
[tex]0.25 M=\frac{0.75 moles}{volume}[/tex]
volume*0.25 M= 0.75 moles
[tex]volume=\frac{0.75 moles}{0.25 M}[/tex]
volume= 3 L
The volume of the solution is 3 L.
Convert each of the following masses to the units requested
A. 500 liter to deciliters
B. 4200 km to hm
Read the selection from the section "Molecules In Motion." The molecules in the hot soup are traveling faster overall than they did before the soup was heated. Conversely, the molecules in an ice cube are moving more slowly. Why did the author use the word "conversely"?
Answer: The author used the word "conversely" because the first statement he made is in CONTRAST to the second statement he made.
Explanation:
Matter is made up of atoms or molecules that are in constant motion. The motion of these tiny particles ( molecules) gives the object energy. The movement of these molecules depends on the state of matter which includes
--> GASEOUS STATE: Here, the particles are completely free to move and are always in motion.
--> LIQUID STATE: particles in this state slide by one another and are always in motion.
--> SOLID STATE: particles in this state are held tightly together but are always in motion.
Also, the molecules in motion are greatly affected by temperature changes. Increase in temperature will cause the particles in the liquid to move faster. Such is seen when soup is heated, the molecules travel faster than before. But the OPPOSITE is seen in an ice cube. This is because the ice cube is in solid state and of a lower temperature.
if the ima of a machine is 4 and the effort force is 6.0 newtons, then the force exerted on the resistance by the machine is
Answer:
24 N
Explanation:
Mechanical advantage is the rate of load overcome to the effort applied to overcome the load or resistance. Also, it is the quotient of the resistance force to the effort force.
i.e MA = [tex]\frac{L}{E}[/tex]
Given that, MA = 4, and L = 6.0 N, then;
4 = [tex]\frac{L}{6}[/tex]
cross multiply to have
L = 4 x 6
= 24 N
L = 24 N
Thus, the force exerted on the resistance by the machine is 24 N.
C6H12O6 (aq) -> 2 C2H5OH (aq) + 2 CO2 (g)
a. How many moles of CO2 are produced when 0.400 mol of C6H12O6 reacts in this
fashion?
b. How many grams of C6H12O6 are needed to form 7.50 g of C2H5OH?
c. How many grams of CO2 form when 7.50 g of C2H5OH are produced?
Answer:
a. 0.8 moles of CO₂ are produced when 0.400 mol of C₆H₁₂O₆ reacts.
b. 7.5 grams of C₂H₅OH are produced by 14.67 grams of C₆H₁₂O₆.
c. 7.17 grams of CO₂ form when 7.50 g of C₂H₅OH are produced.
Explanation:
The balanced reaction is:
C₆H₁₂O₆ → 2 C₂H₅OH + 2 CO₂
By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:
C₆H₁₂O₆: 1 mole C₂H₅OH: 2 molesCO₂: 2 molesThe molar mass of each compound is:
C₆H₁₂O₆: 180 g/moleC₂H₅OH: 46 g/moleCO₂: 44 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
C₆H₁₂O₆: 1 mole* 180 g/mole= 180 gC₂H₅OH: 2 moles* 46 g/mole= 92 gCO₂: 2 moles* 44 g/mole= 88 gThen you can apply the following rules of three:
a. If 1 mole of C₆H₁₂O₆ produces 2 moles of CO₂, 0.4 moles of C₆H₁₂O₆ produces how many moles of CO₂?
[tex]moles of CO_{2} =\frac{0.4 moles of C_{6} H_{12} O_{6} *2moles of CO_{2} }{1 mole of C_{6} H_{12} O_{6} }[/tex]
moles of CO₂= 0.8 moles
0.8 moles of CO₂ are produced when 0.400 mol of C₆H₁₂O₆ reacts.
b. If 92 grams of C₂H₅OH are produced by 180 grams of C₆H₁₂O₆, 7.5 grams of C₂H₅OH are produced by how many mass of C₆H₁₂O₆?
[tex]mass of C_{6} H_{12} O_{6}=\frac{7.5 grams of C_{2} H_{5} OH* 180 grams of C_{6} H_{12} O_{6}}{92grams of C_{2} H_{5} OH}[/tex]
mass of C₆H₁₂O₆= 14.67 grams
7.5 grams of C₂H₅OH are produced by 14.67 grams of C₆H₁₂O₆.
c. If 92 grams of C₂H₅OH are produced along with 88 grams of CO₂, 7.5 grams of C₂H₅OH are produced along with how many mass of CO₂?
[tex]mass of CO_{2}=\frac{7.5 grams of C_{2} H_{5} OH* 88 grams of C O_{2}}{92grams of C_{2} H_{5} OH}[/tex]
mass of CO₂= 7.17 grams
7.17 grams of CO₂ form when 7.50 g of C₂H₅OH are produced.
Timed PLS help
Given the following reaction:
2 Al + 2 KOH + 4 H2SO4 + 22 H2O --> 3 H2 + 2KAl(SO4)2•12H2O
If you start with 8.3 mL of 9.9M sulfuric acid, what is the theoretical yield of alum?
Answer:
19.5g is the theoretical yield of alum
Explanation:
Based on the balanced reaction, 4 moles of sulfuric acid produce 2 moles of alum. To solve this question we need to find the moles of H2SO4. With these moles we can find the moles of alum and its mass assuming all sulfuric acid reacts producing alum.
Moles Sulfuric Acid:
8.3mL = 0.0083L * (9.9mol/L) = 0.08217 moles sulfuric acid
Moles Alum:
0.08217 moles sulfuric acid * (2mol KAl(SO4)2•12H2O / 4mol H2SO4) =
0.041085 moles KAl(SO4)2•12H2O
Mass Alum -Molar mass: 474.3884 g/mol-
0.041085 moles KAl(SO4)2•12H2O * (474.3884 g/mol) =
19.5g is the theoretical yield of alumWhich sublevel contains valance electrons in an atom of magnesium (mg)?
A. 2s
B. 2p
C. 3s
D. 3p
A compound contains 46.67% Silicon and 53.33% oxygen. What is the
simplest formula for this compound?
Answer:
SiO2
Explanation:
Un método de laboratorio para preparar O 2 (g) consiste en la descomposición de KCIO 3 (s): KCIO 3 (s) KCI(s) + O 2 (g) a) ¿Cuántos moles de O 2 se producen cuando se descomponen 32,8 g de KCIO 3 ? b) ¿Cuántos gramos de KCIO 3 deben descomponerse para obtener 50 g de 02? c) ¿Cuántos gramos de KCI se forman al descomponerse KCIO 3 formándose 28,3 g de O2? 3. ¿Cuántos gramos de Ag 2 CO 3 deben haberse descompuesto si se obtuvieron 7511 g de Ag según la reacción: Ag 2 CO 3 Ag(s) + CO 2 (g) + O 2 (g)?
Answer:
2a. 0.401 moles de O2
b. 127.7g KClO3
c. 43.95g KCl
3. 9600g Ag2CO3 debieron haberse descompuesto
Explanation:
Basados en la reaccion:
2KCIO 3 (s) → 2KCI(s) + 3O 2
2 moles de KClO3 producen 3 moles de oxígeno:
a. 32.8g de KClO3 son:
Moles KClO3 -Masa molar: 122.55g/mol-
32.8g * (1mol / 122.55g) = 0.2676 moles KClO3
Moles O2:
0.2676 moles KClO3 * (3moles O2 / 2mol KClO3) =
0.401 moles de O2
b. 50g O2 son:
Moles O2 -Masa molar: 32g/mol-
50g O2 * (1mol/32g) = 1.5625 moles O2
Moles KClO3:
1.5625 moles O2 * (2mol KClO3 / 3mol O2) = 1.042 moles KClO3
Masa KClO3:
1.042 moles KClO3 * (122.55g/mol) =
127.7g KClO3
c. Las moles de O2 son:
28.3g O2 * (1mol / 32g) = 0.88 moles O2
Moles KCl:
0.88 moles O2 * (2mol KCl / 3mol O2) = 0.5896 moles KCl
Masa KCl -Masa molar: 74.55g/mol-
0.5896 moles KCl * (74,55g/mol) = 43.95g KCl
3. Basados en la reacción:
2Ag 2 CO 3 → 4Ag(s) + 2CO 2 (g) + O 2 (g)?
2 moles de Ag2CO3 reaccionan produciendo 4 moles de Ag. Las moles de Ag son:
Moles Ag -Masa molar: 107.8682g/mol-
7511g Ag * (1mol/107.8682g) = 69.63 moles Ag
Moles Ag2CO3:
69.63 moles Ag * (2moles Ag2CO3/4molesAg) = 34.82 moles Ag2CO3
Masa Ag2CO3-Masa molar: 275.7453g/mol-
34.82 moles Ag2CO3 * (275.7453g/mol) =
9600g Ag2CO3 debieron haberse descompuesto
what is the photoelectic effect
Answer:
When electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.
Explanation:
I'm assuming you mean the photoelectric effect.
A mixture consists of 25.60 grams of iron and
4.25 grams of silver. What is the mole fraction of
silver?
Answer:it will be 425/10
Explanation:cause you are asking fraction so if you divide it by 10 dot would go backwards
A change in 1 degree Celsius is = a change in 1 Kelvin
True
False
Answer:
true
Explanation:
because I'm smart yes yes
Is ivy a monocot or dicot
Answer:
dicot
Explanation:
I looked it up lmoooo
If an animal has 64 chromosomes in their body cells, how many chromosomes would be in would be in a cell?
Answer:
i think its 32
Explanation:
why is water so important for the ecosystem
Answer:
The main function of water is to enhance the plant growth provide a permanent for species that live within it, or provide a temporary home or breeding ground for multiple amphibians, insects and water-birthed organismsand to provide the nutrients and minerals necessary to sustain physical life.
In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. Which postulate of kinetic molecular theory best explains
how this is possible?
Attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly
O Collisions between gas particles are elastic, there is no net gain or loss of kinetic energy
Gases consist of a large number of small particles, with a lot of space between the particles
O Gas particles are in constant, random motion, and higher kinetic energy means faster movement
answer:Collisions between gas particlCollisions between gas particles or collisions with the vessel walls are perfectly elastic.
explanation:As long as an ideal gas is maintained at a constant temperature, the average kinetic energy of the molecules is said to be constant. In fact, what we call the temperature of a body at the macroscopic scale is just a representation of the kinetic energy carried by its atoms or molecules as they vibrate inside the body.
Now, if the kinetic energy of this oxygen gas is constant, it is because the collisions between the particles are assumed to be perfectly elastic. No energy is lost during the collisions. The rationale behind this assumption is that the particles are very tiny.
The answer which corresponds best to the explanation above is b. Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy.
(13)
QUESTION 5
5.1
Sulphur reacts with iron according to the equation:
Fe +S → FeS
The reaction requires large amount of heat
When 2,5g sulphur and 5 g iron were placed in a test tube and heated strongly, a
reaction took place to produce a greyish black solid. After the reaction was completed
the solid was found to be magnetic.
5.1.1 Why was this greyish black solid magnetic?
5.1.2 Calculate the mass of Fos produced
Answer:
The black solid is magnetic due to the special property of iron called ferromagnetism
6.9 g
Explanation:
The substance FeS is magnetic despite of the fact Fe^2+ is spin paired due to the special magnetic property of iron called ferromagnetism.
The equation of the reaction is;
Fe(s) + S(s) ----> FeS(s)
Number of moles of Fe = 5g/56g/mol = 0.089 moles
Since the reaction is 1:1, 0.089 moles of FeS is formed
For Sulphur;
Number of moles of sulphur = 2.5g/32 g/mol = 0.078 moles
Since the reaction is 1:1, 0.078 moles of FeS is formed
Hence sulphur is the limiting reactant.
So, mass of FeS produced = 0.078 × 87.91 g/mol = 6.9 g
Identify all of the spectator ions in the reaction below.
Zn(OH)2(s) + 2H+(aq) + 2NO3(aq) → Zn2+(aq) + 2NO3- (aq) + 2H2O
a. Zn(OH)2
b. NO3-
c. Zn2+
d. H
e. H+ and NO3-
Which sentence about an ocean current is correct
Upwelling is caused by the winds that on the oceans surface is the correct answer.
What are Ocean Current ?Ocean currents are water flow patterns that have an impact on climate zones and weather patterns all around the globe.
When winds blow they push the water from an area and to replace the displaced water water rises from beneath the surface and this process is called Upwelling.
Therefore Option C , Upwelling is caused by the winds that on the oceans surface is the correct answer.
To know more about Ocean Current :
https://brainly.com/question/20823678
#SPJ2
Determine the empirical and molecular formula of a compound composed of 18.24 g Carbon, 0.51 g Hydrogen, and 16.91 g Fluorine has a molar mass 562.0 g/mol.
Answer: the answe
Explanation: 18 cabron - c hydr3gon is is 46.20
What are the coefficients needed to balance this chemical reaction to show that matter is conserved?
Match each renewable energy source with the correct description. solar cell converts sunlight into electricity geothermal energy turns turbines along coastlines wave water falling through dams turns turbines, generates electricity hydroelectricity o heat produced within the Earth
Answer:
Explanation:
solar cell - converts sunlight into electricity
geothermal energy - heat produced within the Earth
wave energy - turns turbines along coastlines
hydroelectricity - water falling through dams turns turbines, generates electricity
Answer:
Explanation:
The renewable energy sources are: solar cell, geothermal, wave and hydroelectricity. Their descriptions are as follows:
converts sunlight into electricity -> solar cell
energy turns turbines along coastlines -> wave
water falling through dams turns turbines, generates electricity -> hydroelectricity
heat produced within the Earth -> geothermal
A 800mL of gas sample at STP is compressed to a volume of 200 mL, and temperature increased to 30 °C, what will be the new pressure in kpa.
Answer:
449.7 kPa
Explanation:
We prepare the Ideal Gases Law to solve this question:
P . V = n . R . T
As moles of gas are the same, and R is constant, we can compare this two situations:
P₁ . V₁ / T₁ and P₂ . V₂ / T₂
As this remains constant we can propose:
P₁ . V₁ / T₁ = P₂ . V₂ / T₂
We convert T° to Absolute value: 30°C + 273 = 303 K
We convert the volume from mL to L
800 mL . 1L /1000 mL = 0.8 L
200 mL . 1L /1000 mL = 0.2 L
1 atm . 0.8 L / 273 K = P₂ . 0.2L / 303k
(0.8 L.atm / 273K ) . 303k = P₂ . 0.2L
0.8879 L.atm / 0.2L = 4.4 atm
We convert pressure from atm to kPa
4.4 atm . 101.3 kPa / 1 atm = 449.7 kPa
Answer:
450. kPa
Explanation:
Use the combined gas law. Solve for the unknown. Plug in the numbers, turn the crank, and out pops the answer. A typical plug-n-chug problem.
P1V1 / T1 = P2V2 / T2 …………….. combined gas law
P2 = P1V1T2 / (T1V2) ……………… solve for P2
P2 = 101.3 kPa x 800. mL x 303K / 273K / 200. mL
P2 = 450. kPa
We are assuming 3 significant digits, simply because it makes more sense than having only one significant digit. You didn’t actually specify a pressure unit, but I’m guessing you mean kilopascal, (kPa).
After a 4.626g sample of silver oxide is heated, 4.306g of silver metal remains. What is the empirical formula of the compound?
please help me ;(
Answer:
The empirical formula is Ag2O.
The empirical formula is Ag2O.Explanation:
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.
The empirical formula is Ag2O.Explanation:The empirical formula is the simplest whole-number ratio of atoms in a compound.The ratio of atoms is the same as the ratio of moles. So our job is to calculate the molar ratio of Ag to 2O.
do the steps ...
To get this into an integer ratio, we divide both numbers by the smaller value.
From this point on, I like to summarize the calculations in a table.
ElementAgMass/gXMolesXllRatiomllIntegers
—————————————————−———mAgXXXm7.96Xm0.07377Xll2.00mmm2
mlOXXXXl0.59mm0.0369Xml1mmmml1
There are 2 mol of Ag for 1 mol of O.
Answer:
Hello There!!
Explanation:
The answer is↬The empirical formula is Ag2O. It is the simplest whole-number ratio of atoms in a compound.
hope this helps,have a great day!!
~Pinky~
An ionic substance is formed between a positively charged cation and a negatively charged anion. Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions. Which of the following substances are ionic? Check all that apply. Check all that apply. AlCl3 MgI2 C2H5OH NH3
Answer:
Which of the following substances are ionic?
Check all that apply.
AlCl3
MgI2
C2H5OH
NH3
Explanation:
An ionic substance is formed between a positively charged cation and a negatively charged anion.
Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions.
Among the given substances,
MgI2 is an ionic substance.
Since Mg is the metal atom. It forms a cation.
I is a nonmetal atom. It forms anion.
Hence,
MgI2 is an ionic substance.
Though AlCl3 looks like an ionic substance it is a covalent compound.
This is due to the high polarizability of [tex]Al^3+[/tex] ion.
The remaining two compounds do not contain any metal atoms.
So, ethanol and NH3 are not ionic compounds.
Answer:
MgI2
• Determine % H2O2 decomposed in first 500 s in a first order decomposition reaction of H2O2? k=7.30x10-4 s-1
Answer:
Given rate constant of the first-order reaction is:
K=7.30x10^-4 s-1
Time t=500s
Determine % H2O2 decomposed in first 500 s in a first-order decomposition reaction of H2O2?
Explanation:
The expression for the rate constant of the first-order reaction is:
[tex]k=\frac{2.303}{t} log \frac{ao}{a-x}[/tex]
where,
k=rate constant
t=time period
ao=initial amount of the reactant
a-x=amount of a remained after time t.
Substitute the given values in the above formula to get ao/a-x value.
[tex]7.30x10^-4 s^-1 = \frac{2.303}{500s} log \frac{ao}{a-x} \\log \frac{ao}{a-x} =7.30x10^-4 s^-1 * \frac{500s}{2.303} \\log \frac{ao}{a-x} =0.158\\\frac{ao}{a-x}=10^{0.158} \\\frac{ao}{a-x}=1.438[/tex]
% of H2O2 decomposed is:
[tex]\frac{ao}{a-x} = 1.438 *100\\ =143.8[/tex]
Dos moléculas de Clorato de Potasio en estado sólido, al aplicarle calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso ¿como se representan?
Answer:
2KClO3 (s) -------> 2KCl (s) + 3O2 (g)
Explanation:
Una ecuación de reacción química es una representación simbólica de lo que sucede en un recipiente de reacción.
Al escribir la ecuación de reacción química para una reacción particular, se utilizan los símbolos químicos de todas las especies involucradas.
Por la reacción. en el cual dos moléculas de Clorato de Potasio en estado sólido, al aplicar calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso, la ecuación de reacción se escribe así;
2KClO3 (s) -------> 2KCl (s) + 3O2 (g)
La regla para escribir ecuaciones de reacción química balanceada es que el número de átomos de cada elemento en el lado derecho de la ecuación de reacción debe ser el mismo que el número b de átomos del mismo elemento en el lado izquierdo de la ecuación de reacción.
Si realizamos un conteo de átomos simple en ambos lados de la ecuación de reacción, la regla se cumple
What is the mass of 4.7 moles of H2O
Answer:
ans.........❣️❣️❣️❣️❣️❣️❣️❣️❣️❣️❣️
Answer:
[tex]1 \: mole \: weighs \: 18 \: g \\ 4.7 \: moles \: weigh \: (4.7 \times 18) \: g \\ = 84.6 \: g[/tex]
Susan wants to go back to college. She has a lot of debit and she needs to take out a loan. What you would you recommend that she does? Remember to answer in complete sentences.
Answer:
Firstly, search for proper Job by which she can earn money & from that money she can use it for her study
Explanation:
If I was in that situation, then I would do this.
I am sorry if you wouldn't like mine suggestion
How many valence electrons does Chlorine need to GAIN to become stable?
Answer:
An atom of a group 17 element such as chlorine has seven valence electrons. It is “eager” to gain an extra electron to fill its outer energy level and gain stability. Group 16 elements with six valence electrons are almost as reactive for the same reason
Explanation:
