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Percentage Composition

A compound is...

Question

A compound is $21$ g forms $9.6$ g of $C O_{2}$ . Estimate the percentage of oxygen.

30.45

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42.5

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12.14

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None of the above

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Solution

The correct option is C $12.14$ %
$%$ of Oxygen $= \frac{16}{44} \times \frac{M a s s o f C O_{2} f o r m e d}{M a s s o f o r g a n i c c o m p o u n d} \times 100$
$⟹ %$ of Oxygen $= \frac{16}{44} \times \frac{9.6}{21} \times 100$
$⟹ %$ of Oxygen $= 12.14 %$

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