Practice Stoichiometry in Chemistry
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
The branch of chemistry that uses balanced chemical equations and mole ratios to calculate the precise quantities of reactants consumed and products formed in chemical.
Using the recipe (balanced equation) to figure out how much of each ingredient you need.
Example 1
mediumHow many grams of \text{O}_2 are needed to completely burn 16.0 g of \text{CH}_4? (\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O})
Example 2
hardHow many grams of \text{NH}_3 can be produced from 28.0 g of \text{N}_2 and excess \text{H}_2? (\text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3)
Example 3
mediumHow many moles of \text{H}_2\text{O} are produced when 3.0 mol of \text{H}_2 reacts with excess \text{O}_2? (2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O})
Example 4
mediumHow many grams of \text{NaCl} form from 0.50 mol of \text{Cl}_2 reacting with excess sodium? (2\text{Na} + \text{Cl}_2 \rightarrow 2\text{NaCl}; molar mass of \text{NaCl} = 58.44\,\text{g/mol})