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For a real gas (mol.mass =60) if density...

For a real gas (mol.mass =60) if density at critical point is `0.80g//cm^(-3)` and its `T_(c)=(4xx10^(5))/(821)K,` then van der Waals' constant a ( in atm `L^(2)mol^(-2)`) is

A

0.3375

B

3.375

C

1.68

D

0.025

Text Solution

Verified by Experts

The correct Answer is:
b
(b) `V_(c)=(60)/(0.80)=75cm^(3)mol^(-1),`
`b=(V_(c))/(3)=25cm^(3)mol^(-1)=0.025Lmol^(-1)`
`:." "T_(c)=(8a)/(27Rb)`
`(4xx10^(5))/(821)=(8xxa)/(27xx0.0821xx0.025)`
`implies" "a=3.375`
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