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Addition Reaction

Percentage by...

Question

Percentage by mass of sulfur in $H_{2} {S O}_{4}$ is :

16%

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33%

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36%

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42%

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cannot be determined

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Solution

The correct option is A 33%
Atomic mass of sulfur $= 32$ g
Molecular weight of $H_{2} S O_{4} = 2 + 32 + 64 = 98$ g
Percentage of sulfur in sulphuric acid $= \frac{32}{98} \times 100 = 33$

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