Question

define law of constant proportion with example

Answer 1

The law of Constant proportion states that, ' The proportion by weight of the constituent elements in various samples of a compound is fixed'
eg. The proportion by weight of Hydrogen and Oxygen in water is 1:8. This means that 9g water is formed by a chemical combinationof 1g Hydrogen and 8g Oxygen

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.