Q: Which of the following is the correct formula for percent yield?

$$\displaystyle \frac{\text{actual yield}}{\text{theoretical yield}} \times 100\%$$

Question 1

Which of the following best describes a limiting reactant in a chemical reaction?

Accepted Answer

The reactant that determines the amount of product formed.

Question 2

A student mixes 0.50 mol of NaCl with 0.30 mol of AgNO$$_3 in $$water. The reaction is: $$\mathrm{NaCl(aq) + $$AgNO_3$$(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)}. $$What is the limiting reactant?

Accepted Answer

AgNO$$_3$$

Question 3

Which of the following is the correct balanced chemical equation for the combustion of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

$$\mathrm{CH_4$ + 2O_2 \rightarrow CO_2$ + 2H_2O}$$

Question 4

A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 500.0 mL of solution. What is the molarity ($$M) of $$the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.171\ M$$

Question 5

Which of the following statements about strong electrolytes is correct?

Accepted Answer

They completely dissociate into ions in solution.

Question 6

Which of the following is a net ionic equation for the precipitation reaction between aqueous solutions of Pb(NO$$_3$$)$$_2$$ and KI?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$(aq) + 2I^-(aq) \rightarrow $$PbI_2$$(s)}$$

Question 7

A 25.0 mL sample of 0.200 M HCl is titrated with 0.100 M NaOH. What volume of NaOH is required to reach the equivalence point?

Accepted Answer

$$50.0\ \mathrm{mL}$$

Question 8

Which of the following best describes the role of a solvent in a solution?

Accepted Answer

It is the substance that dissolves the solute.

Question 9

A gas occupies 4.00 L at 1.00 atm and 300 K. What volume will it occupy at 2.00 atm and 300 K? (Assume ideal gas behavior.)

Accepted Answer

$$2.00\ \mathrm{L}$$

Question 10

Which of the following is the correct expression for the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 11

At STP, what is the molar volume of an ideal gas?

Accepted Answer

$$22.4\ \mathrm{L}$$

Question 12

A mixture contains 2.0 mol of O$$_2$$ and 3.0 mol of N$$_2 in a $$container at a total pressure of 5.0 atm. What is the partial pressure of O$$_2$$?

Accepted Answer

$$2.0\ \mathrm{atm}$$

Question 13

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms when two solutions are mixed.

Question 14

Which of the following is a strong acid?

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl})$$

Question 15

Which law states that the volume of a gas is directly proportional to its temperature at constant pressure?

Accepted Answer

Charles’s law

Question 16

A sample of gas at 25°C and 1.00 atm is collected over water. The vapor pressure of water at 25°C is 23.8 mmHg. If the total pressure is 760 mmHg, what is the partial pressure of the dry gas?

Accepted Answer

$$736.2\ \mathrm{mmHg}$$

Question 17

Which of the following best describes a nonelectrolyte?

Accepted Answer

A substance that does not dissociate into ions in solution.

Question 18

Which of the following is the correct formula for percent yield?

Accepted Answer

$$\displaystyle \frac{	ext{actual yield}}{	ext{theoretical yield}} 	imes 100\%$$

Question 19

Which of the following best describes the kinetic molecular theory of gases?

Accepted Answer

Gas particles are in constant, random motion and collisions are perfectly elastic.

Question 20

According to Graham’s law of effusion, which gas will effuse faster: hydrogen ($$\mathrm{H_2$}$$, molar mass = 2 g/mol) or oxygen ($$\mathrm{O_2$}$$, molar mass = 32 g/mol)?

Accepted Answer

Hydrogen, because it is lighter.

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