Question

law of constant proportion with example

Answer 1

   Any pure chemical substance (compound) formed by the same elements will be formed by combining them same proportions by mass.

  Pure Water H2O  will always be formed with 2 grams of hydrogen to 16 grams of oxygen. that i s  H : O = 1 : 8..always.

same way sodium chloride will always contain  23 : 35.5 of  Sodium : chlorine, no matter how the compound is formed through any process.

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.