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Relationship between Vapor Density & Relative Molecular Mass

An organic co...

Question

An organic compound has the empirical formula $C H_{2} O$ vapor density of that compound is 90. Find out the molecular formula of the compound.

A

C_{6} H_{12} O_{6}

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B

C_{6} H_{6} O_{6}

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C

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

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D

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

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Solution

The correct option is A $C_{6} H_{12} O_{6}$
$v a p o u r d e n s i t y = 90$
$M o l . w t = 90 \times 2 = 180$
$E m p . f o r m u l a = C H_{2} O$
$E m p . f o r m u l a w t = 30$
$M o l . f o r m u l a = C H_{2} O \times 6 = C_{6} H_{12} O_{6}$

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