Grade 10 · Science
Use ratios in balanced reactions practice
Use a supplied balanced equation or molar mass to calculate amounts with stated units.
Opening your practice adventure…
Try a sample
A sample has mass 44 g and molar mass 22 g/mol. How many moles are present?
- 968 mol
- 22 mol
- 2 mol
- 66 mol
See the answer & why
2 mol
44 g ÷ 22 g/mol = 2 mol.
A little hint: Read coefficients as mole ratios, and use only the supplied molar masses for mass conversions.
A teaching tip
Read coefficients as mole ratios, and use only the supplied molar masses for mass conversions.