Find the approximate percentage composition of oxygen by mass in the compound $H C I O_{4}$ ?

75%

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64%

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32%

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50%

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16%

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Solution

The correct option is B 64%
The approximate percentage composition of oxygen by mass in the compound $H C l O 4$ is 64%.
The atomic masses (in g/mol) of H, Cl and O are 1, 35.5 and 16 respectively.
Molar mass of $H C l O_{4} = 1 + 35.5 + 4 (16) = 100.5 g / m o l$ .
Mass of O present in 1 mole of $H C l O_{4} = 6 (16) = 64 g$ .
Percent composition of oxygen $= \frac{64 \times 100}{100.5} ≃ 64$ %.

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