Hydrogen and oxygen combine to form water. Which law states that water always contains hydrogen and oxygen in a fixed ratio by mass?
Law of Constant Proportions
The Law of Constant (Definite) Proportions was proposed by French chemist Joseph Proust in 1799.
It states that a given chemical compound always contains its constituent elements in the same proportion by mass, irrespective of the source or the method of preparation.
Water (H2O), whether obtained from a river, a well or the laboratory, always contains hydrogen and oxygen in the fixed mass ratio of 1 : 8 (2 g of hydrogen combine with 16 g of oxygen).
Boyle's Law relates pressure and volume of a gas; Dalton's Law of Multiple Proportions applies when two elements form more than one compound; Avogadro's Law deals with the volume-mole relationship of gases.
Hence, the answer is Law of Constant Proportions.
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