explain the law of constant proportion.
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The law of constant proportion states that a given chemical compound always contains its component elements in fixed ratio and does not depends on its surface and method of preparation.
Law of constant proportion
In 1794 the French scientist J. L. Proust stated the law of constant proportions as “The proportion by mass of the constituent elements in the different samples of a compound is fixed,” e.g., the proportion by mass of hydrogen and oxygen in water is obtained from any source 1:8. This means that 9 g water is formed by chemical combination of 1 g hydrogen and 8 g oxygen. Similarly, the proportion by mass of carbon and oxygen in carbon dioxide obtained from any source is 3:8. This means that in 44 g of carbondioxide there is 12 g of carbon and 32 g of oxygen so that the proportion by mass of carbon and oxygen is 3:8.