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CAIE IGCSE Chemistry 3.3.8 Percentage Yield Percentage Questions

Use stoichiometry to calculate percentage yield, purity and composition from actual reaction data.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • calculate percentage yield from actual and theoretical product mass
  • determine percentage purity from reacting quantities
  • identify limiting reactants in chemical reactions
  • calculate percentage composition of compounds and minerals
  • apply stoichiometry to fermentation, hydration and thermal decomposition
  • compare actual and theoretical reaction outputs

CAIE IGCSE Chemistry 3.3.8 Percentage Yield Percentage Questions question 1

[Maximum number: 1]

When heated, copper(II) oxide, CuO , reacts with ammonia, NH3\mathrm{NH}_{3}.

3CuO+2NH3→3Cu+N2+3H2O3 \mathrm{CuO}+2 \mathrm{NH}_{3} \rightarrow 3 \mathrm{Cu}+\mathrm{N}_{2}+3 \mathrm{H}_{2} \mathrm{O}

8.5 g of ammonia reacts with an excess of copper(II) oxide to produce 26.4 g of copper.

What is the percentage yield of copper in this reaction?

A

27.5%

B

32.2\%

C

55.0\%

D

82.5\%

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