Law of constant proportions: According to this law, in a chemical substance, the elements are always present in definite proportions by mass”.
For example: In ammonia (NH3), nitrogen and hydrogen are always present in the ratio of 14:3 by mass whatever the source is.
Similarly In water, hydrogen and oxygen are always present in the ratio of 1:8 by mass, whatever the source water is.
Final Answer: Hence law of constant proportions states that in a chemical substance, the elements are always present in definite proportions by mass”.
For example: In ammonia (NH3), nitrogen and hydrogen are always present in the ratio of 14:3 by mass whatever the source is.
