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What is the unit of van der Waal's gas c...

What is the unit of van der Waal's gas constant 'a' ?

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The value of van der Waals' constant 'a' for gases O_2, N_2 , NH_3 and CH_4 re 1.360,1.390,4.170 and 2.253 litre^2 atm mol^(-2) respectively. The gas which can most easily be liquefied is :

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