Moles from mass and molar mass

Convert a sample’s mass to amount of substance.

Understand the idea

Use amount in moles = mass in grams ÷ molar mass in grams per mole. The practice supplies the molar mass, so focus on the conversion.

See a worked example

A 36 g sample with molar mass 18 g/mol contains 36/18 = 2 mol.

A useful check

Molar mass is not the sample’s total mass. Check the units cancel to mol.

Try a fresh practice set

Five questions with feedback on every answer. New sets can repeat familiar ideas so you can practise again. This is practice, not a certified assessment.

Number range / challenge

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