Question 1

Which of the following best describes the purpose of a gas stoichiometry chart in chemical reactions?

Accepted Answer

To find the unknown quantity of a compound using the known quantity of another compound.

Question 2

In the reaction $$4Ag + O_2$ \rightarrow 2Ag_2O$$, what is the mole ratio of silver to silver oxide?

Accepted Answer

$$4:2$$

Question 3

A student reacts 384 mL of oxygen gas at STP with excess silver. Using the reaction $$4Ag + O_2$ \rightarrow 2Ag_2O$$, what is the first step in determining the mass of $$Ag_2O$$ produced?

Accepted Answer

Convert the volume of $$O_2 to $$moles.

Question 4

Given the reaction $$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O$$, how many moles of $$CO_2$$ are produced from 1 mole of glucose?

Accepted Answer

$$6$$ moles

Question 5

If 15.1 L of diphosphorus pentoxide gas is produced at STP from the reaction $$P_4 + 5O_2$$ \rightarrow 2P_2O_5$$, what is the mass of phosphorus that reacted?

Accepted Answer

$$10.3 g$$

Question 6

In a gas stoichiometry problem, why is it important to use coefficients from the balanced equation?

Accepted Answer

They provide the mole-to-mole ratios needed for calculations.

Question 7

Which step is necessary when converting from moles of a known substance to moles of an unknown substance in a chemical reaction?

Accepted Answer

Use the coefficients from the balanced equation.

Question 8

A reaction produces $$2.31 g of$$ $$CO_2 at$$ $$34^	ext{o}C$$ and $$724$$ mmHg. What is the correct formula to calculate the volume of $$CO_2$$ produced?

Accepted Answer

$$V = \frac{nRT}{P}$$

Question 9

In the reaction $$4NH_3 + 5O_2 \rightarrow 4NO + 6H_2O$$, how many grams of water are produced when $$15.1 L of$$ $$NH_3 (at $$STP) reacts with excess $$O_2$$?

Accepted Answer

$$22.7 g$$

Question 10

Why is it important to identify the limiting reactant in a stoichiometry problem?

Accepted Answer

It determines the maximum amount of product that can be formed.

Question 11

A student calculates the theoretical yield of a reaction but obtains less product than expected. What is the most likely reason?

Accepted Answer

The reaction was not complete or there were losses during the process.

Question 12

Which of the following is a real-world application of gas stoichiometry?

Accepted Answer

Calculating the amount of oxygen needed for a hospital ventilator.

Question 13

In the reaction $$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O$$, what is the mass of $$CO_2$$ produced from $$180 g of $$glucose?

Accepted Answer

$$264 g$$

Question 14

Which equation is used to relate the pressure, volume, temperature, and number of moles of a gas in stoichiometry problems?

Accepted Answer

$$PV = nRT$$

Question 15

A chemical reaction produces $$2$$ moles of $$H_2O$$ for every $$1$$ mole of $$O_2$$ consumed. If $$5$$ moles of $$O_2$$ are used, how many moles of $$H_2O$$ are produced?

Accepted Answer

$$10$$ moles

Question 16

Which of the following steps is NOT part of solving a gas stoichiometry problem?

Accepted Answer

Measure the color of the reactants.

Question 17

In the reaction $$4Ag + O_2$ \rightarrow 2Ag_2O$$, what is the theoretical yield of $$Ag_2O if$$ $$0.50$$ moles of $$O_2$$ are reacted with excess $$Ag$$?

Accepted Answer

$$1.0$$ moles

Question 18

A reaction requires $$5$$ moles of $$O_2 to $$produce $$2$$ moles of $$P_2O_5. If $$only $$2.5$$ moles of $$O_2$$ are available, what is the maximum number of moles of $$P_2O_5$$ that can be produced?

Accepted Answer

$$1.0$$ moles

Question 19

Which of the following is the correct sequence of steps for solving a gas stoichiometry problem?

Accepted Answer

Convert known to moles, use mole ratio, convert to desired units.

Gas Stoichiometry and Mole-to-Mole Calculations

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