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Stoichiometry

This worksheet covers Stoichiometry, which is part of the Chemical Reactions module in the Chemistry course. Practice problems are designed to strengthen key concepts and build confidence.

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Stoichiometry

Chemical Reactions • Chemistry

Set 3 — Foundation

1.

What is the molar mass of water, $H_{2}O$ ?

A.

$18.02 \text{ g/mol}$

B.

$16.00 \text{ g/mol}$

2.

In the reaction $2H_{2} + O_{2} \rightarrow 2H_{2}O$ , how many moles of are produced from 4 moles of ?

3.

What is the coefficient for $O_{2}$ in the balanced reaction $C_{3}H_{8} + O_{2} \rightarrow CO_{2} + H_{2}O$ ?

4.

How many grams of $NaCl$ are produced from 2 moles of $Na$ and 2 moles of $Cl_{2}$ in the reaction $2 N a + C l_{}$ ?

5.

If 10 g of $CaCO_{3}$ decomposes, how many grams of $CaO$ will be produced? The reaction is $CaCO_{3} \rightarrow CaO + CO_{2}$ .

6.

In the reaction $2H_{2} + O_{2} \rightarrow 2H_{2}O$ , what is the ratio of moles of to ?

7.

How many moles are in 36 g of water, $H_{2}O$ ?

A.

$1 \text{ mole}$

B.

$2 \text{ moles}$

8.

What is the total number of atoms in 2 moles of $H_{2}SO_{4}$ ?

A.

$14$

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16.00

g/mol

C.

$20.18 \text{ g/mol}$

D.

$22.00 \text{ g/mol}$

2

O

H_{2}O

H_{2}

A.

$2 \text{ moles}$

B.

$4 \text{ moles}$

C.

$1 \text{ mole}$

D.

$3 \text{ moles}$

8

+

O2→

CO2+

H2O

A.

$5$

B.

$3$

C.

$4$

D.

$2$

2 N a + C l_{2} \to 2 N a Cl

A.

$117 \text{ g}$

B.

$58.5 \text{ g}$

C.

$100 \text{ g}$

D.

$71 \text{ g}$

a

C

O3

→

CaO+

CO2

A.

$5.6 \text{ g}$

B.

$4.4 \text{ g}$

C.

$6.0 \text{ g}$

D.

$7.0 \text{ g}$

2

O

H_{2}

O_{2}

A.

$1:1$

B.

$2:1$

C.

$2:2$

D.

$1:2$

moles

C.

$0.5 \text{ moles}$

D.

$3 \text{ moles}$

14

B.

$8$

C.

$16$

D.

$12$

9.

What is the volume of $1$ mole of an ideal gas at standard temperature and pressure (STP)?

A.

$22.4 \text{ L}$

B.

$24.0 \text{ L}$

C.

$20.0 \text{ L}$

D.

$18.0 \text{ L}$

10.

In the equation $2H_{2} + O_{2} \rightarrow 2H_{2}O$ , how many total moles of reactants are there?

A.

$4$

B.

$2$

C.

$6$

D.

$3$