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Molecular mass of a gas is 78 . Its den...

Molecular mass of a gas is 78 . Its density at `98 ^(@)C` and 1 atm will be

A

`200 g L^(-1)`

B

`2 . 56 g L^(-1)`

C

`256 g L^(-1)`

D

`78 g L^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`P = 1 atm`, `T = 98^(@)C+273 = 371 K, M = 78g mol^(-1)`
`R = 0.0821" L atm K"^(-1)mol^(-1)`
PM=dRT or `d=(PM)/(RT)=(1xx78)/(0.0821xx371)=2.56 g L^(-1)`
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