Year 11 maths · D.2 · Science Calculations: Circuits and Chemistry
Moles and molar mass
Moles = mass ÷ molar mass.
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How many moles are in 80 g of oxygen gas (O₂, 32 g/mol)?
Answer: 2.5 mol
How many moles are in 29.25 g of table salt (NaCl, 58.5 g/mol)?
Answer: 0.5 mol
How many moles are in 160 g of oxygen gas (O₂, 32 g/mol)?
Answer: 5 mol
Tip: Moles = mass ÷ molar mass.
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