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The van der Waals constants for two gase...

The van der Waals constants for two gases are as follows :
`{:("Gas",a(atm L^(2)mol^(-2)),b(L Mol^(-1))),(X,1.39,0.0391),(Y,3.59,0.0427):}`
Which of them is more easily liquefiable and which has greater molecular size ?

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