•The Law of Constant Proportion, also known as the Law of Definite Proportions.
•This law states that a specific chemical compound is composed of the same elements in the same fixed proportions by mass, regardless of the source or method of preparation.
•For example, in water (H2O), the law of constant proportion dictates that the mass ratio of hydrogen to oxygen is always 2:16, or simplified, 1:8.
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