Science · Grades 10–12
Mass and amount of substance
Use compatible mass units: grams with grams per mole.
The key idea
Use compatible mass units: grams with grams per mole.
n = m/M
Worked examples
A sample has mass 154 g and molar mass 77 g/mol. Find its amount in mol.
154/77 = 2
2 mol
A sample has mass 437 g and molar mass 23 g/mol. Find its amount in mol.
437/23 = 19
19 mol
Try it yourself
A sample has mass 228 g and molar mass 12 g/mol. Find its amount in mol.
A sample has mass 224 g and molar mass 16 g/mol. Find its amount in mol.
Check your understanding
Answers and marking notes
- 19 mol
228/12 = 19
- 14 mol
224/16 = 14
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.