A-LevelChemistryAtoms, molecules and stoichiometryFeb/Mar 2025Paper 1 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
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The correct answer is D. This question tests the candidate's understanding of atoms, molecules and stoichiometry within the Chemistrysyllabus. The examiner's mark scheme requires...
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