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Relationship between Vapor Density & Relative Molecular Mass

The empirical...

Question

The empirical formula of a compound of molecular mass 120 is $C H_{2} O$ . The molecular formula of the compound is:

A

C_{2} H_{2} O_{2}

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B

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

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C

C_{3} H_{6} O_{9}

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D

none of the above

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Solution

The correct option is C $C_{4} H_{8} O_{4}$
$C H_{2} O$ has mass $12 + 2 + 16 = 30 g$ .
Molar mass is 120 g/mole which is 4 times 30, so 4 times $C H_{2} O$ is $C_{4} H_{8} O_{4}$ .

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