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Mass Percentage

The mass perc...

Question

The mass percentage of phosphorus in $H_{3} P O_{4}$ is:

22.22 %

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31.63 %

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28.57 %

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45 %

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Solution

The correct option is B $31.63 %$
We know, gram molar mass of $H_{3} P O_{4} = 98 g$
Mass of phosphorus in $H_{3} P O_{4} = 31 g$
% of phosphorus $= \frac{Mass of element}{Mass of the compound} \times 100 = 31.63 %$
Structure of $H_{3} P O_{4}$ :

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