Question

law of constant proportion.?​

Answer 1

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✍States that in a pure chemical compound elements are always present in a definite proportion by mass.

Answer 2

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The law of constant proportion was given by Joseph Louis proust. It says that in a chemical substance (compound) elements are always present in definite proportion by mass.

For example: In a compound such as water the ratio of mass of hydrogen to the mass of oxygen is always 1:8. Thus, if 9 grams of water is decomposed 1 gram of hydrogen and 8 grams of oxygen are always obtained.