Question 1

A chemical reaction is carried out at STP: $$2H_2 + O_2$ \rightarrow 2H_2O. If $$you start with 4.0 g of hydrogen gas ($$H_2$$), what volume of oxygen gas ($$O_2) at $$STP is required for complete reaction?

Accepted Answer

$$11.2 L$$

Question 2

Which of the following best describes a mass-mass stoichiometry problem?

Accepted Answer

Calculating the mass of a product formed from a given mass of reactant

Question 3

In a reaction at STP, $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$, what volume of NH_3$ gas is produced from 6.72$ L of N_2$ gas?

Accepted Answer

$$13.44 L$$

Question 4

A student reacts $$16.0 g of$$ $$O_2$$ with excess $$CH_4$$ according to $$CH_4 + 2O_2$$ \rightarrow $$CO_2 + 2H_2O$. What mass of CO_2$ is produced?

Accepted Answer

$$11.0 g$$

Question 5

Which conversion factor is used in a volume-volume stoichiometry problem at STP?

Accepted Answer

Mole ratio from the balanced equation

Question 6

If $$2.00$$ mol of $$H_2$$ reacts with $$O_2 at $$STP, what volume of $$H_2O$$ vapor is produced? ($$2H_2 + O_2$ \rightarrow 2H_2O)$$

Accepted Answer

$$22.4 L$$

Question 7

A reaction produces $$4.48 L of$$ $$CO_2$$ gas at STP. How many grams of $$Na_2CO_3$$ were decomposed? ($$Na_2CO_3 \rightarrow Na_2O + CO_2$)

Accepted Answer

$$47.7 g$$

Question 8

Which of the following is NOT a necessary step in solving a mass-volume stoichiometry problem at STP?

Accepted Answer

Convert volume directly to mass without using moles

Question 9

A hospital uses $$O_2$$ for patients. If $$67.2 L of$$ $$O_2 is $$needed, how many moles of $$O_2 is $$this at STP?

Accepted Answer

$$3.00$$ mol

Question 10

In the reaction $$2KClO_3 \rightarrow 2KCl + 3O_2$$, what volume of $$O_2$$ gas at STP is produced from $$12.25 g of$$ $$KClO_3$$?

Accepted Answer

$$4.48 L$$

Question 11

A factory burns $$32.0 g of$$ $$CH_4 in $$excess $$O_2. $$What volume of $$CO_2$$ gas is produced at STP? ($$CH_4 + 2O_2$$ \rightarrow $$CO_2 + 2H_2O$)

Accepted Answer

$$22.4 L$$

Question 12

Which statement about volume-volume stoichiometry at STP is correct?

Accepted Answer

Volumes of gases can be directly compared using the coefficients in the balanced equation

Question 13

A student collects $$13.44 L of$$ $$H_2$$ gas at STP from the reaction $$Zn + 2HCl \rightarrow $$ZnCl_2$$ + H_2$. What mass of Zn$ was used?

Accepted Answer

$$26.0 g$$

Question 14

Which of the following is a correct sequence for solving a mass-mass stoichiometry problem?

Accepted Answer

Convert mass to moles, use mole ratio, convert moles to mass

Question 15

A reaction at STP produces $$22.4 L of$$ $$N_2$$ gas. How many grams of $$NH_4NO_2$$ decomposed? ($$NH_4NO_2 \rightarrow N_2$ + 2H_2O)$$

Accepted Answer

$$60.0 g$$

Question 16

Which of the following is true about mass-volume stoichiometry at STP?

Accepted Answer

You must convert mass to moles, use the mole ratio, then convert moles to volume using $$22.4 L/$$mol

Question 17

A car's airbag inflates using the reaction $$2NaN_3 \rightarrow 2Na + 3N_2. If$$ $$65.0 g of$$ $$NaN_3 is $$used, what volume of $$N_2$$ gas is produced at STP?

Accepted Answer

$$44.8 L$$

Question 18

Which of the following is a common error when solving volume-volume stoichiometry problems at STP?

Accepted Answer

Failing to use the mole ratio from the balanced equation

Question 19

A reaction at STP: $$C_2H_4 + 3O_2 \rightarrow 2CO_2 + 2H_2O. If$$ $$6.72 L of$$ $$C_2H_4 is $$burned, what volume of $$CO_2 is $$produced?

Accepted Answer

$$13.44 L$$

Question 20

Which of the following is NOT a type of stoichiometry problem covered in the study materials?

Accepted Answer

Mole-mole (not specifically listed)

Stoichiometry: Mass and Volume Relationships in Chemical Reactions

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