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  4. According to law of constant proportion, irrespective of the source, pure sample of water always yields X % mass of oxygen and Y % mass of hydrogen. The value of ' X ' is.

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Q. According to law of constant proportion, irrespective of the source, pure sample of water always yields $X \%$ mass of oxygen and $Y \%$ mass of hydrogen. The value of ' $X$ ' is_________.

Some Basic Concepts of Chemistry

Solution:

$\%$ oxygen in water $=\frac{16}{18} \times 100 \%$
$=88.89 \%$