Question

11. 2.75 g of cupric oxide was reduced by heating in a current of hydrogen and the weight of copper
that remained was 2.196 g. Another experiment, 2.358 g of copper was dissolved in nitric acid
and the resulting copper nitrate converted into cupric oxide by ignition. The weight of cupric
oxide formed was 2.952 g. Show that these results illustrate law of constant composition.
Hint: In first case % of oxygen in CuO = 20.14%. In second case % of oxygen in CuO = 20.12%
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Answer 1

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