Extracting metals from their ores
2 marks · EasyCopper(II) oxide can be reduced by carbon to extract copper metal.
In an experiment, 8.0 g of copper(II) oxide is heated with carbon and produces 6.4 g of copper.
Calculate the mass of oxygen removed from the copper(II) oxide.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
1.6 g (±0.1)
Common mistakes: Subtracts wrong way around
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Marking points
M1 · 1 mark · Shows mass of oxygen = mass of CuO – mass of Cu.
A1 · 1 mark · Correct answer: 1.6 g.
Worked solution
Mass of oxygen removed = mass of copper(II) oxide − mass of copper