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Question

A sample of pure water, irrespective of source, contains 88.89% oxygen and 11.11% hydrogen
by mass. The data supports the:

A
law of conservation of mass
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B
law of constant composition
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C
law of multiple proportion
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D
law of reciprocal proportion
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Solution

The correct option is B law of constant composition
According to the law of constant composition in a given compound, the elements always combine in the same proportion as each other.
Water(H2O) molecule consists of two hydrogen atoms of relative mass 1 and one oxygen atom of relative mass 16.

Therefore, the ratio in which 2 atoms of hydrogen and one atom of oxygen are combined is 1:8 and will always be the same irrespective of the source of water.

Therefore, the correct option is B

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