Question

state law of constant proportion

Answer 1

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The law of constant proportions was given by Joseph Proust in 1779.
According to the law of constant proportions: A chemical compound always consists of the same elements combined together in the same proportion by mass.
For example: aWater is a compound which always consists of the two same elements i.e. hydrogen and oxygen.
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Answer 2

The law of constant proportions states that when a compound is broken, the masses of the constituent elements remain in the same proportion. Or, in a chemical compound, the elements are always present in definite proportions by mass.

This means each compound has the same elements in the same proportions, regardless of where the compound was obtained, who prepared it, or its mass.

This law was formulated and proven by Joseph Louis Proust in 1799.