A sample of water obtained from two different sources is found to contain hydrogen and oxygen in the ratio 1:8 by mass. Which law is illustrated by this observation?
Law of constant proportions
The observation is that water taken from any source contains hydrogen and oxygen combined in exactly the same mass ratio, 1 : 8. That is, a pure chemical compound always contains the same elements in the same fixed proportion by mass, regardless of its source.
This is the statement of the law of constant proportions (also called the law of definite proportions). The law of conservation of mass is about total mass being unchanged in a reaction; the law of multiple proportions applies when two elements form more than one compound; the law of reciprocal proportions relates the mass ratios of a third element combining with two others.
Hence, the answer is Law of constant proportions.
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