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Mole Concept

The vapor den...

Question

The vapor density of gas A is four times that of B. If the molecular mass of B is M, then the molecular mass of A is:

M

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4 M

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\frac{M}{4}

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2 M

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Solution

The correct option is C $4 M$
$M o l e c u l a r m a s s = 2 \times v a p o u r d e n s i t y$
$\frac{M_{A}}{M_{B}} = \frac{V . D_{A}}{V . D_{B}} = \frac{4}{1}$
Thus, $M_{A} = 4 \times M_{B}$ .

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