Which statement best illustrates the Law of Constant Proportions when considering the composition of water from different sources?
Water from any source contains hydrogen and oxygen in the same mass ratio.
The Law of Constant (Definite) Proportions (Proust) says that a pure compound always contains the same elements in the same fixed proportion by mass, whatever its source or method of preparation.
Pure water from a river, rain or the laboratory always has hydrogen and oxygen in the mass ratio 1 : 8.
Combining 'in any ratio' or 'in different ratios by source' contradicts the law, and conditions of formation do not change the composition.
Hence, water from any source contains hydrogen and oxygen in the same mass ratio.
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