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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

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

$18.02 \text{ g/mol}$

$16.00 \text{ g/mol}$

$20.18 \text{ g/mol}$

$22.00 \text{ g/mol}$

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

$2 \text{ moles}$

$4 \text{ moles}$

$1 \text{ mole}$

$3 \text{ moles}$

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

$5$

$3$

$4$

$2$

How many grams of $NaCl$ are produced from 2 moles of $Na$ and 2 moles of $Cl_{2}$ in the reaction $2Na + Cl_{2} \rightarrow 2NaCl$ ?

$117 \text{ g}$

$58.5 \text{ g}$

$100 \text{ g}$

$71 \text{ g}$

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

$5.6 \text{ g}$

$4.4 \text{ g}$

$6.0 \text{ g}$

$7.0 \text{ g}$

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

$1:1$

$2:1$

$2:2$

$1:2$

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

$1 \text{ mole}$

$2 \text{ moles}$

$0.5 \text{ moles}$

$3 \text{ moles}$

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

$14$

$8$

$16$

$12$

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

$22.4 \text{ L}$

$24.0 \text{ L}$

$20.0 \text{ L}$

$18.0 \text{ L}$

10.

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

$4$

$2$

$6$

$3$

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