Practice question
Question
How many grams of CuSO₄ are required to produce 12.8 g of Cu with excess Zn? (Molar masses: CuSO₄ = 159.5 g/mol, Cu = 64 g/mol)
Explanation
Reaction: CuSO₄ + Zn → Cu + ZnSO₄. Moles of Cu = 12.8/64 = 0.2 mol. 1 mol Cu from 1 mol CuSO₄; mass = 0.2 × 159.5 = 31.9 g.
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