Question

Name the law of chemical combination given by Proust.

Answer 1

The law of chemical combination given by Proust is the Law of definite proportions.

Law of definite proportions:

The law of definite proportions states that in a chemical formula of a compound, the ratio of component elements is a fixed whole number ratio regardless of the source of the compound.

Example:

In a water molecule $\mathbf{\left(}{\mathbf{H}}_{\mathbf{2}}\mathbf{O}\mathbf{\right)}$, the ratio of the number of hydrogen atoms to oxygen atoms is always $2:1$.