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Relationship between Vapor Density & Relative Molecular Mass

A gaseous mix...

Question

A gaseous mixture of $H_{2}$ and ${C O}_{2}$ gases contains 66 mass % ${C O}_{2}$ . The vapour density of the mixture is

A

6.1

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B

5.4

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C

2.7

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D

10.8

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Solution

The correct option is B 2.7
No. of moles of $C O_{2}$ in $100 g$ mixture
$= \frac{66}{44} = 1.5$
No. of moles of $H_{2}$ in $100 g$ mixture
$= \frac{34}{2} = 17$
$M_{a v e r a g e} = \frac{100}{18.5} = 5.40$
V.D. = $\frac{5.4}{2} = 2.7$

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