Question 1

Which of the following best describes the purpose of a solution stoichiometry chart in chemical calculations?

Accepted Answer

To use the given quantity of a compound to determine the unknown quantity of another compound.

Question 2

Given the reaction: $$2 	ext{HCl} (aq) + 	ext{Mg} (s) ightarrow 	ext{MgCl}_2 (aq) + 	ext{H}_2 (g)$$, how many moles of HCl are required to completely react with 0.5 moles of Mg?

Accepted Answer

$$1.0$$ moles

Question 3

In a stoichiometry problem, after converting the given quantity to moles, what is the next step according to the study material?

Accepted Answer

Do a mole to mole comparison to convert moles of given into moles of unknown.

Question 4

A student mixes 0.25 mol of $$	ext{Ca(OH)}_2$$ with excess $$	ext{HBr}$$ according to the equation: $$2 	ext{HBr} (aq) + 	ext{Ca(OH)}_2 (aq) ightarrow 	ext{CaBr}_2 (aq) + 2 	ext{H}_2	ext{O} (l). $$How many moles of $$	ext{H}_2	ext{O}$$ are produced?

Accepted Answer

$$0.50$$ moles

Question 5

If 34.12 mL of HBr is required to neutralize 52.86 mL of 0.138 M $$	ext{Ca(OH)}_2$$, what is the molarity of the HBr solution? (Use $$2 	ext{HBr} + 	ext{Ca(OH)}_2 ightarrow 	ext{CaBr}_2 + 2 	ext{H}_2	ext{O})$$

Accepted Answer

$$0.715 M$$

Question 6

Which of the following is the correct sequence of steps for solving a solution stoichiometry problem involving volume and molarity?

Accepted Answer

Convert given quantity to moles, do a mole to mole comparison, convert moles of unknown to desired units.

Question 7

In the reaction $$2 	ext{NaOH} + 	ext{MnO}_2 + 	ext{SO}_2 ightarrow 	ext{Na}_2	ext{SO}_3 + 	ext{Mn(OH)}_2$$, how many grams of $$	ext{Mn(OH)}_2 ($$molar mass = 89.0 g/mol) are formed when 32.0 mL of 0.140 M $$	ext{SO}_2$$ reacts with excess $$	ext{NaOH}$$ and $$	ext{MnO}_2$$?

Accepted Answer

$$0.089 g$$

Question 8

A solution contains 0.250 mol of $$	ext{H}_2	ext{SO}_4. $$How many moles of $$	ext{NaOH}$$ are required to completely neutralize the acid? (Reaction: $$	ext{H}_2	ext{SO}_4 + 2 	ext{NaOH} ightarrow 	ext{Na}_2	ext{SO}_4 + 2 	ext{H}_2	ext{O})$$

Accepted Answer

$$0.500$$ mol

Question 9

Which of the following best explains why the limiting reactant determines the maximum amount of product formed in a chemical reaction?

Accepted Answer

It is the reactant that is completely consumed first, thus stopping the reaction.

Question 10

A chemist needs to prepare 500 mL of 0.250 M $$	ext{NaCl}$$ solution. How many grams of $$	ext{NaCl} ($$molar mass = 58.44 g/mol) are required?

Accepted Answer

$$2.92 g$$

Question 11

Which equation correctly relates molarity, moles, and volume?

Accepted Answer

$$M = \frac{n}{V}$$

Question 12

If 16.2 g of Mg (molar mass = 24.3 g/mol) reacts with excess HCl, how many liters of $$	ext{H}_2$$ gas are produced at STP? (Reaction: $$2 	ext{HCl} + 	ext{Mg} ightarrow 	ext{MgCl}_2 + 	ext{H}_2$$; 1 mol gas at STP = 22.4 L)

Accepted Answer

$$7.47 L$$

Question 13

A reaction yields 0.50 mol of product, but the theoretical yield is 0.80 mol. What is the percent yield?

Accepted Answer

$$62.5\%$$

Question 14

Which of the following is NOT a step in the solution stoichiometry process described in the study material?

Accepted Answer

Calculate the empirical formula.

Question 15

In a laboratory, a student mixes 0.10 mol of $$	ext{H}_2	ext{SO}_4$$ with 0.15 mol of $$	ext{NaOH}. $$Which reactant is limiting? (Reaction: $$	ext{H}_2	ext{SO}_4 + 2 	ext{NaOH} ightarrow 	ext{Na}_2	ext{SO}_4 + 2 	ext{H}_2	ext{O})$$

Accepted Answer

$$	ext{NaOH}$$

Solution Stoichiometry and Mole-to-Mole Comparisons

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