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Mass Number and Representation of Atom

Irrespective ...

Question

Irrespective of the source, pure sample of water always yields 88.89% by mass of oxygen and 11.11% mass of hydrogen. This illustrates the law of
(A)constant proportion
(B)conservation of mass
(C)multiple proportion
(D)reciprocal proportion

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Solution

The results are in accordance to law of constant proportion. It states that all samples of a given chemical compound have the same elemental composition by mass. Oxygen will always make up about 8/9 of the mass of any sample of water, while hydrogen will make up the remaining 1/9 of the mass.

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