work by real gas
wrote P in terms of V from real gas eqn then W = Pdv integral
everything figured out but what should be unit of "a" ? should i convert to m^4

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@Dexter
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.Depends on r value you take na.
Ah okay work is in joules
Yes
well work is asked in joules so R= 8.314 use hoga . volume in m^3 thus a in m^4 too