WAEC - Chemistry (2018 - No. 40)
The law of definite proportions states that
pure samples of the same compound contain the same elements combined in the same proportion by mass
pure samples of substances are in the same proportion by mass
chemical compounds are pure because they contain the same elements
matter can neither be created nor destroyed.
Maelezo
The Law of Definite Proportions states that all pure samples of a particular chemical compound contain similar elements combined in the same proportion by mass.