Practice Mole in Chemistry
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A counting unit for atoms and molecules, equal to 6.022 \times 10^{23} particles (atoms, molecules, or ions).
A 'chemist's dozen'—a huge number that makes atom-counting practical.
Example 1
easyWhat is a mole and why is it useful in chemistry?
Example 2
mediumHow many moles of water are in 36.0 g of \text{H}_2\text{O}? (Molar mass of \text{H}_2\text{O} = 18.0\,\text{g/mol})
Example 3
easyHow many moles are in 40.0 g of NaOH? (Molar mass = 40.0\,\text{g/mol})
Example 4
easyA sample contains 1.204 \times 10^{24} molecules of ammonia. How many moles of \text{NH}_3 is this?