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Q.

A and B are two identical vessels. A contains 15 g ethane at 1 atm and 298 K. The vessel B contains 75g of gas X2 at same temperature and pressure. The vapour density  of X2 is:

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a

37.5

b

150

c

75

d

45

answer is A.

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Detailed Solution

The vapor density is found by the formula,

Molecular mass of ethane = 30 gm

Molecular mass of gas = M

1530=75M

⇒M=150∴V⋅D=75

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