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Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of:

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Conservation of mass

Constant composition

Multiple proportion

Constant volume

answer is B.

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Detailed Solution

According to law of constant composition, a given compound always contain elements in fixed ratio by mass, irrespective of origin or methods of preparation.

So, the mass percentage of oxygen and hydrogen in water is remain the same irrespective of the fact of its origin or methods of preparation.

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