Ethyl alcohol always contains 52% carbon,13% hydrogen,and 35% oxygen by mass.What law is illustrated by this statement?

Question

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The statement "Ethyl alcohol always contains 52% carbon, 13% hydrogen, and 35% oxygen by mass" illustrates the law of constant composition, which states that any pure compound will always contain the same elements in the same proportion by mass. This means that regardless of the source or method of preparation, ethyl alcohol will always have the same percentage composition of carbon, hydrogen, and oxygen.

Ethyl Alcohol Always Contains 52% Carbon,13% Hydrogen,and 35% Oxygen by Mass.What