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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