Chemistry · Oct / Nov 2017 · Paper 12 · Question 10
5070The mole and the Avogadro constant
25.0 g of hydrated copper(II) sulfate crystals are heated to produce anhydrous copper(II) sulfate and water vapour. CuSO4.5H2O(s) → CuSO4(s) + 5H2O(g) What is the mass of anhydrous copper(II) sulfate formed? [Mr: CuSO4, 160; H2O, 18]
- A9.0 g
- B16.0 g
- C22.5 g
- D25.0 g
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Correct answer: B. 16.0 g
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