2.75 g of cupric oxide was reduced by heating in a current of hydrogen and weight of copper that remained was 2.196g . In another experiment, 2.358 g of copper was dissolved in nitric acid and result copper nitrate converted into cupric oxide by ignition. The weight of cupric oxide formed was 2.952g . Show that these results illustrate law of constant composition.
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Law of constant proportion means whatever be the method of preparation of a compoundthe compoisition remains the same.
I method
Weight of copper oxide = 2.75 g
Weight of copper = 2.196 g
2.75 g of the copper oxide contained 2.196 g of the metal
100 g of the copper oxide contained = 2.196/2.75 x 100 = 79.86 %
II method
2.952 g of copper oxide contains 2.358 g of copper
100 g of the copper oxide contained = 2.358/2.952 x 100 = 79.87 %
For the law of constant proportion, the % obtained should be same in both the methods.