In an experiment 1.975 gram of copper oxide gave 1.575 gram of copper on heating in hydrogen, in another experiment 0.4725 gram of copper was heated in air for a long time and it gave 0.5925 gram of cupric oxide. Prove that these illustrate the law of definite proportion.
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Answers
First experiment
∙ Copper oxide =1.375g
∙ Copper left =1.098g
∙ Oxygen present =1.375−1.098=0.277g
Percentage of oxygen in CuO=(0.277)(100 %) 1.375=20.15 %
Second Experiment
∙ Copper taken =1.179g
∙ Copper oxide formed =1.476g
∙ Oxygen present =1.476−1.179=0.297g
Percentage of oxygen in CuO=(0.297)(100 %) 1.476=20.12 %
Percentage of oxygen is approximately (within significant figures limit) the same in both the above cases. So the law of constant composition is illustrated.
In chemistry, the law of definite proportion, sometimes called Proust's law or the law of definite composition, or law of constant composition states that a given chemical compound always contains its component elements in fixed ratio and does not depend on its source and method of preparation.