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Percentage Composition of an Element in a Compound

The percentag...

Question

The percentage of carbon in carbonic acid is

A

19.35%

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B

50%

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C

81%

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Solution

The correct option is A 19.35%
The total weight of carbonic acid $H_{2} C O_{3}$

$= (2 x H) + C + (3 x O) = (2 x 1 u) + 12 u + (3 x 16 u) = 62 u$

Mass % of carbon

$= \frac{Mass of carbon in carbonic acid}{Total mass of carbonic acid} x 100 = \frac{12 u}{62 u} x 100 = 19.35 %$

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