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Chemistry · Grades 9–12

Amount to mass

Multiply amount in moles by molar mass in g/mol to find mass in grams.

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Rule and assumptions

Multiply amount in moles by molar mass in g/mol to find mass in grams.

m = nM

Worked examples

A sample contains 3.7 mol and has stated molar mass 88 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.

m = nM 3.7 × 88 = 325.6

325.6 g

A sample contains 3.6 mol and has stated molar mass 71 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.

m = nM 3.6 × 71 = 255.6

255.6 g

Try two questions

  1. A sample contains 2.7 mol and has stated molar mass 94 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.

  2. A sample contains 3.2 mol and has stated molar mass 123 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.

Answers and reasoning

Answers and marking notes
  1. 253.8 g

    m = nM 2.7 × 94 = 253.8

  2. 393.6 g

    m = nM 3.2 × 123 = 393.6

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.

Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.