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Amount of substance

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Question 8

Aspirin (C9H8O4\text{C}_9\text{H}_8\text{O}_4C9​H8​O4​) is produced industrially by reacting salicylic acid (C7H6O3\text{C}_7\text{H}_6\text{O}_3C7​H6​O3​, Mr=138.0M_r = 138.0Mr​=138.0) with ethanoic anhydride. One mole of salicylic acid reacts to produce one mole of aspirin.

Calculate the mass, in kg, of salicylic acid needed to produce 450 kg450\text{ kg}450 kg of aspirin. Assume a 100%100\%100% yield.

(Relative atomic masses, ArA_rAr​: C=12.0\text{C} = 12.0C=12.0, H=1.0\text{H} = 1.0H=1.0, O=16.0\text{O} = 16.0O=16.0)

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Markscheme

Amount of substance Questions

  1. A Level
  2. /Chemistry
  3. /Amount of substance

79 exam-style questions on AQA A Level Chemistry Amount of substance, covering Relative atomic mass and relative molecular mass, The mole and the Avogadro constant, The ideal gas equation, Empirical and molecular formula, and Balanced equations and associated calculations. Each one has a worked solution and a mark scheme showing where the marks go.

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