What is the percent yield of NaCl if 31.0 g of CuCl2 reacts with excess NaNO3 to produce 21.2 g of NaCl?

Answers

Answer 1

Answer: First you need to find the balanced chemical formula.
CuCl₂+2NaNO₃→2NaCl+Cu(NO₃)₂

Then you can find out how much NaCl 31.0g of CuCl₂ should produce using stoichiometry. Divide 31.0g by the molar mass of CuCl₂ (134.446g/mol) to get 0.2306mol CuCl₂. Than multiply 0.2306mol CuCl₂ by 2 to get 0.4612mol NaCl. Than multiply 0.4612mol by the molar mass of NaCl (58.45g/mol) to get 26.95g of NaCl.
that means that 100% yield would give you 26.95g of NaCl so to find percent yield divide 21.2 by 26.95 to get 0.7867 which is 78.7% yield

Therefore the answer is 78.7% yield.
I hope this helps. Let me know if anything is unclear

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Which value has more significant figures? A)2.63x10^6 B)0.0000026
Ammonia is an important ingredient in many fertilizers. The main process by which ammonia is made is the Haber process. In this process, nitrogen gas and hydrogen gas are reacted to form ammonia at high temperatures. Which of the following most likely explains why this reaction is carried out at high temperature?Ammonia is unstable at room temperature. High temperatures increase the activation energy of the reaction. High temperatures make the gas molecules move more quickly. The reaction becomes exothermic at high temperatures.

Which of the following is a correct definition of the term armature? A. A type of resistant wire B. A type of dry cell battery C. A circuit diagram D. A small lever in a relay switch

Answers

option a. a type of resistant wire

a revolving structure in an electric motor or generator, wound with the coils that carry the current.

Answer:

The correct option is: D. A small lever in a relay switch

Explanation:

Armature is a constituting part of an electric machine, that can be used as a stationary or rotating part. It is a conductor or a conducting coil that carries alternating current and can generate electromotive force.

In a solenoid, the movable steel or iron part that functions as a switch or relay is also termed as the armature.

What is the identity of a sample that has a mass of 8.97 g and a volume of 0.79 cm3?A.copper
B.gold
C.lead
D.iron

Answers

Answer: The correct option is Option C.

Explanation:

To identify the sample, we will determine the density of the unknown sample and match it with the specific densities. The equation used to calculate the density of a sample is given by:

$Density=(Mass)/(Volume)$

We are given:

Mass of the sample = 8.97 g

Volume of the sample = $0.79cm^3$

Putting values in above equation, we get:

$\text{Density of the sample}=(8.97g)/(0.79cm^3)=11.35g/cm^3$

This value of density matches the specific density of lead.

Hence, the correct option is Option C.

Calculate the density:

$m=8.97 \ g \nV=0.79 \ cm^3 \n \n\rho=(m)/(V)=(8.79 \ g)/(0.79 \ cm^3) \approx 11.35 \ (g)/(cm^3)$

It's the density of lead, so the answer is C.

In a solution made by dissolving 50 grams of calcium chloride in 1000 grams of water, which component is considered to be the solute?

Answers

Calcium chloride is the solute because it was dissolved in water.
Therefore water is the solvent.

Solute is a particle which gets dissolved in a solution. It is usually smaller than solvent in quantity.

Solvent is a particle which dissolves Solute in a solution. It is usually larger than solute in quantity.

In your case above, Calcium chloride is in less quantity, and thus, Calcium chloride shall be called solute.

Describe your accuracy of your density measurements asummunf that you correctly identified your mystery solid and liquid

Answers

I don’t know the answer

Particles in an object are constantly moving. the particles also attract and repel each other. this attraction and movement can be classified as _________.A. Specific heat
B.heat
C.temperature
D. thermal energy

Answers

Answer:

Thermal energy.

Explanation:

Thermal energy is related to heat of the system, so higher the heat in the system more the thermal energy and this will cause more movement. In case of less thermal energy, less movement and hence more attractions.

A) specific heat : it is the heat required to raise the temperature of one unit of a substance by one degree.

B) Heat is not a property of system. It is given and taken out from the system which changes its temperature and thermal energy.

C) Temperature is measurement of heat.

Particles in an object are constantly moving. The particles also attract and repel each other. this attraction and movement can be classified as D.Thermal Energy

Thermal energy is energy that comes from heat, it's part of energy of total energy of any object.

Hope this helps :)

How many formula units are there in 0.9876 grams of zinc hydroxide

Answers

mass molar of zinc hydroxide Zn(OH)2 = 99.424 g/mol

1 mole ----------> 99.424 g
mole ----------> 0.9876 g

mole = 0.9876 / 99.424

= 0.00993 moles of Zn(OH)2

1 mole ------------> 6.02x10²³
0.00993 ----------> units

units = 0.00993 * 6.02x10²³

= 5.977x10^21 formula units.

hope this helps!.

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