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Relationship between Vapor Density & Relative Molecular Mass

M g of a subs...

Question

M g of a substance when vaporised occupy a volume of 5.6 litre at NTP. The molecular mass of the substance will be:

A

M

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B

2 M

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C

3 M

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D

4 M

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Solution

The correct option is D $4 M$
Given,
$M g$ of substance occupy volume $= 5.6 l i t r e$ at NTP.
At NTP,
1 mol occupy 22.4 litre of volume.
5.6 litre $= M g$
22.4 litres $= 4 M g$ of substance.
So, Molecular mass of gas $= 4 M g / m o l$

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