Question

State the law of constant proportion. Give one example to illustrate this law

Answer 1

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.

Answer 2

all pure samples of the same chemical compound contain the same elements combine the same proportion by mass.

Or

all chemical compound always have the same fixed composition by weight