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  4. The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. The illustrate the law of

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Q. The percentage of copper and oxygen in samples of $CuO$ obtained by different methods were found to be the same. The illustrate the law of

Some Basic Concepts of Chemistry

Solution:

Law of constant proportions according to which a pure chemical compound always contains same elements combined together in the same definite proportion of weight.