Question 1

Given the balanced equation $$\mathrm{Fe_2O_3 + 3SO_3 \rightarrow Fe_2$(SO_4$)_3}$$, how many grams of $$\mathrm{SO_3$}$$ are required to react completely with $$3.59$$ mol of $$\mathrm{Fe_2O_3}$$? (Molar mass of $$\mathrm{SO_3$} is$$ $$80.07 g/$$mol)

Accepted Answer

$$862 g$$

Question 2

For the reaction $$\mathrm{$$CaCO_3$$ + 2HCl \rightarrow $$CaCl_2$$ + CO_2$ + H_2O}$$, how many grams of $$\mathrm{CO_2$}$$ are produced if $$2.09$$ mol of $$\mathrm{HCl}$$ are reacted? (Molar mass of $$\mathrm{CO_2$} is$$ $$44.01 g/$$mol)

Accepted Answer

$$45.9 g$$

Question 3

In the photosynthesis reaction $$\mathrm{6CO_2 + 6H_2O \rightarrow 6O_2 + C_6H_{12}O_6$}$$, how many grams of glucose ($$\mathrm{C_6H_{12}O_6$}) $$are produced if $$17.3$$ mol of $$\mathrm{H_2O}$$ are reacted? (Molar mass of $$\mathrm{C_6H_{12}O_6$} is$$ $$180.16 g/$$mol)

Accepted Answer

$$519 g$$

Question 4

How many grams of $$\mathrm{$$CaCl_2$$}$$ are produced if $$56.6$$ grams of $$\mathrm{$$CaCO_3$$}$$ are reacted according to $$\mathrm{$$CaCO_3$$ + 2HCl \rightarrow $$CaCl_2$$ + CO_2$ + H_2O}$$? (Molar mass: $$\mathrm{$$CaCO_3$$}$$ = $$100.09 g/$$mol, $$\mathrm{$$CaCl_2$$}$$ = $$110.98 g/$$mol)

Accepted Answer

$$62.8 g$$

Question 5

In the reaction $$\mathrm{6CO_2 + 6H_2O \rightarrow 6O_2 + C_6H_{12}O_6$}$$, how many grams of $$\mathrm{CO_2$}$$ are required to produce $$525 g of$$ $$\mathrm{O_2$}$$? (Molar mass: $$\mathrm{O_2$}$$ = $$32.00 g/$$mol, $$\mathrm{CO_2$}$$ = $$44.01 g/$$mol)

Accepted Answer

$$721 g$$

Question 6

A student wants to produce $$100 g of$$ $$\mathrm{$$CaCl_2$$}$$ using the reaction $$\mathrm{$$CaCO_3$$ + 2HCl \rightarrow $$CaCl_2$$ + CO_2$ + H_2O}. $$What is the minimum mass of $$\mathrm{$$CaCO_3$$}$$ required? (Molar mass: $$\mathrm{$$CaCO_3$$}$$ = $$100.09 g/$$mol, $$\mathrm{$$CaCl_2$$}$$ = $$110.98 g/$$mol)

Accepted Answer

$$90.2 g$$

Question 7

If $$5.00$$ mol of $$\mathrm{CO_2$}$$ are used in the photosynthesis reaction $$\mathrm{6CO_2 + 6H_2O \rightarrow 6O_2 + C_6H_{12}O_6$}$$, how many moles of $$\mathrm{O_2$}$$ are produced?

Accepted Answer

$$5.00$$ mol

Question 8

In the reaction $$\mathrm{$$CaCO_3$$ + 2HCl \rightarrow $$CaCl_2$$ + CO_2$ + H_2O}$$, if $$10.0 g of$$ $$\mathrm{$$CaCO_3$$}$$ reacts with excess $$\mathrm{HCl}$$, what mass of $$\mathrm{CO_2$} is $$produced? (Molar mass: $$\mathrm{$$CaCO_3$$}$$ = $$100.09 g/$$mol, $$\mathrm{CO_2$}$$ = $$44.01 g/$$mol)

Accepted Answer

$$4.40 g$$

Question 9

A chemist has $$20.0 g of$$ $$\mathrm{H_2O}$$ and wants to know how much $$\mathrm{C_6H_{12}O_6$}$$ can be produced via $$\mathrm{6CO_2 + 6H_2O \rightarrow 6O_2 + C_6H_{12}O_6$}. ($$Molar mass: $$\mathrm{H_2O}$$ = $$18.02 g/$$mol, $$\mathrm{C_6H_{12}O_6$}$$ = $$180.16 g/$$mol)

Accepted Answer

$$33.4 g$$

Question 10

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

Accepted Answer

It provides the mole ratios needed to convert between reactants and products.

Question 11

A reaction requires $$2.00$$ mol of $$\mathrm{SO_3$}$$ for every $$1.00$$ mol of $$\mathrm{Fe_2O_3}. If $$you have $$4.00$$ mol of $$\mathrm{SO_3$}$$ and $$2.00$$ mol of $$\mathrm{Fe_2O_3}$$, which is the limiting reactant in $$\mathrm{Fe_2O_3 + 3SO_3 \rightarrow Fe_2$(SO_4$)_3}$$?

Accepted Answer

$$\mathrm{SO_3$}$$

Question 12

If $$100 g of$$ $$\mathrm{CO_2$}$$ are required for photosynthesis, how many grams of $$\mathrm{C_6H_{12}O_6$}$$ can be produced? (Molar mass: $$\mathrm{CO_2$}$$ = $$44.01 g/$$mol, $$\mathrm{C_6H_{12}O_6$}$$ = $$180.16 g/$$mol)

Accepted Answer

$$68.2 g$$

Question 13

Which of the following is the correct sequence of steps for a mass-to-mass stoichiometry calculation?

Accepted Answer

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

Question 14

A sample contains $$0.500$$ mol of $$\mathrm{$$CaCO_3$$}. $$How many grams of $$\mathrm{$$CaCl_2$$}$$ can be produced? (Molar mass: $$\mathrm{$$CaCl_2$$}$$ = $$110.98 g/$$mol)

Accepted Answer

$$55.5 g$$

Question 15

If $$3.00$$ mol of $$\mathrm{HCl}$$ are available, what is the maximum number of moles of $$\mathrm{CO_2$}$$ that can be produced according to $$\mathrm{$$CaCO_3$$ + 2HCl \rightarrow $$CaCl_2$$ + CO_2$ + H_2O}$$?

Accepted Answer

$$1.50$$ mol

Question 16

A reaction vessel contains $$10.0 g of$$ $$\mathrm{CO_2$}$$ and excess $$\mathrm{H_2O}. $$How many grams of $$\mathrm{C_6H_{12}O_6$}$$ can be produced? (Molar mass: $$\mathrm{CO_2$}$$ = $$44.01 g/$$mol, $$\mathrm{C_6H_{12}O_6$}$$ = $$180.16 g/$$mol)

Accepted Answer

$$6.83 g$$

Question 17

Which of the following statements about stoichiometry is FALSE?

Accepted Answer

Stoichiometry ignores the law of conservation of mass.

Question 18

If $$2.00$$ mol of $$\mathrm{$$CaCO_3$$}$$ are reacted with excess $$\mathrm{HCl}$$, how many grams of $$\mathrm{CO_2$}$$ are produced? (Molar mass: $$\mathrm{CO_2$}$$ = $$44.01 g/$$mol)

Accepted Answer

$$88.0 g$$

Stoichiometry Practice: Mole-to-Mass and Mass-to-Mass Calculations

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