Among the following which contain the greatest amount of oxygen by weight?

C_{3} H_{6} O_{5} C l

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C_{3} H_{6} O_{2}

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C_{5} H_{10} O_{5}

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C_{4} H_{8} O_{3}

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All are equal

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Solution

The correct option is B $C_{5} H_{10} O_{5}$
$C_{5} H_{10} O_{5}$ contains the greatest amount of oxygen by weight.
The molecular weight of $C_{5} H_{10} O_{5}$ is $5 (12) + 10 (1) + 5 (16) = 150$ g/mol.
The weight percent of oxygen is $\frac{5 (16)}{150} \times 100 = 53.3$ %
For $C_{3} H_{6} O_{5} C l$ , the weight percent of oxygen is $\frac{5 (16)}{3 (12) + 6 (1) + 5 (16) + 35.5} \times 100 = 50.8$ %
For $C_{3} H_{6} O_{2}$ , the weight percent of oxygen is $\frac{2 (16)}{3 (12) + 6 (1) + 2 (16)} \times 100 = 43.2$ %
For, $C_{4} H_{8} O_{3}$ the weight percent of oxygen is $\frac{3 (16)}{4 (12) + 8 (1) + 3 (16)} \times 100 = 46.2$ %

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