Q: Which of the following is the correct formula for calculating the theoretical yield in a chemical reaction?

$$\text{Theoretical yield} = \text{limiting reactant (mol)} \times \text{molar mass of product (g/mol)}$$

Q: Which of the following is the correct formula for calculating the molarity of a solution?

$$\mathrm{M} = \dfrac{\text{moles of solute}}{\text{volume of solution (L)}}$$

Question 1

Which of the following best describes the role of a balanced chemical equation in stoichiometric calculations?

Accepted Answer

It shows the numerical relationships among chemical amounts, allowing calculation of moles and masses.

Question 2

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

Accepted Answer

AgNO$$_3$$

Question 3

Which equation correctly relates the pressure, volume, and temperature of a gas according to the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 4

A solution is prepared by dissolving 0.25 mol of KBr in enough water to make 0.50 L of solution. What is the molarity of the solution?

Accepted Answer

$$0.50\ \mathrm{mol/L}$$

Question 5

Which of the following is a correct net ionic equation for the reaction between aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 6

Which statement about strong electrolytes is correct?

Accepted Answer

They completely dissociate into ions in water.

Question 7

A sample of gas occupies 2.0 L at 1.0 atm. If the pressure is increased to 2.0 atm at constant temperature, what is the new volume?

Accepted Answer

$$1.0\ \mathrm{L}$$

Question 8

Which of the following is the correct formula for calculating the theoretical yield in a chemical reaction?

Accepted Answer

$$	ext{Theoretical yield} = 	ext{limiting reactant (mol)} 	imes 	ext{molar mass of product (g/mol)}$$

Question 9

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms from two aqueous solutions.

Question 10

A 0.10 M solution of HCl is titrated with 0.10 M NaOH. What is the equivalence point of the titration?

Accepted Answer

When $$[\mathrm{H^+}] = [\mathrm{OH^-}]$$

Question 11

Which of the following is the correct balanced chemical equation for the combustion of methane?

Accepted Answer

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

Question 12

Which of the following is a correct statement about Avogadro's Law?

Accepted Answer

At constant temperature and pressure, the volume of a gas is directly proportional to the number of moles.

Question 13

Which of the following is the correct formula for calculating the molarity of a solution?

Accepted Answer

$$\mathrm{M} = \dfrac{	ext{moles of solute}}{	ext{volume of solution (L)}}$$

Question 14

Which of the following is the correct oxidation half-reaction for the combustion of carbon?

Accepted Answer

Question 15

A 1.0 L solution contains 0.10 mol Na$$_2SO$_4. $$After dilution to 2.0 L, what is the new molarity?

Accepted Answer

$$0.05\ \mathrm{M}$$

Question 16

Which of the following is a strong acid?

Accepted Answer

HCl

Question 17

Which of the following is the correct relationship for Charles's Law?

Accepted Answer

$$\dfrac{V_1$}{T_1$} = \dfrac{V_2$}{T_2$}$$

Question 18

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between reactants.

Question 19

A balloon filled with 2.0 mol of helium at 1.0 atm and 300 K is allowed to expand to 4.0 mol at constant pressure and temperature. What happens to the volume?

Accepted Answer

It doubles.

General Chemistry Study Guide: Chemical Reactions, Quantities, Solutions, and Gases

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