A-LevelChemistryAtoms, molecules and stoichiometry9701/12 · Feb/Mar 2025 · Q21 Mark

Crystals of copper(II) nitrate are prepared by adding an excess of malachite to nitric acid. The formula of malachite is Cu(OH)2•CuCO3. (Mr = 221.0) 12.0 g of malachite is added to 30.0 cm³ of 1.50 moldm⁻³ nitric acid. Which mass of malachite is left unreacted when the reaction is complete?

A2.05 g

B2.49 g

C7.03 g

D9.51 g

✓ Correct answer

D: 9.51 g

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Topic: Atoms, molecules and stoichiometry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2025 Paper 1 Variant 2, question 2.

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Crystals of copper(II) nitrate are prepared by adding an excess of malachite to nitric acid. The formula of malachite is Cu(OH)2•CuCO3. (Mr = 221.0) 12.0 g of malachite is added to 30.0 cm³ of 1.50 moldm⁻³ nitric acid. Which mass of malachite is left unreacted when the reaction is complete?

✓ Correct answer

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