Displacement reactions involving metal oxides
2 marks · EasyWhen 0.24 g of magnesium powder is heated with excess copper(II) oxide, a displacement reaction occurs:
Calculate the maximum mass of copper that can be produced. (Ar: Mg = 24, Cu = 64)
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0.64 g (±0.01)
Common mistakes: Using Ar for Mg or Cu incorrectly; No allowance for 1:1 ratio
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Marking points
M1 · 1 mark · Converts mass of Mg to moles correctly (0.01 mol).
A1 · 1 mark · Correctly calculates the theoretical mass of copper (0.64 g) with proper unit.
Worked solution
1. Calculate moles of Mg:
2. From the equation, 1 mol Mg gives 1 mol Cu. So, 0.01 mol Mg gives 0.01 mol Cu.