Question

dash contains about 11percent (by mass)of hydrogen.​

Answer 1

Answer:

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A sample of pure water,whatever the source always contains 88.8% by mass of oxygen & 11.1%by mass of hydrogen

Answer 2

A sample of pure water,whatever the source always contains 88.8% by mass of oxygen & 11.1%by mass of hydrogen. ... H2O contains H and O in a fixed ratio by mass. It illustrates the law of constant composition or in other words law of conservation of energy.

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