What is the  dimention of a/b and a*b in (  P+a/V^{2 ) (V-b)=RT?}

Where  P=Pressure

            V=Volume

           T=Temperature

( P + a / V2 ) (V-b) = RT

PV + a/V -bP - ab/V2 = RT

ab / V2 = PV + a/V - bP - RT

ab = PV3 + aV - bPV2 - RTV2

From this SIMPLIFICATION

Dimensions of ab is same as Dime. of PV3

Similarly,

( P + a / V2 ) (V-b) = RT

PV + a/V -bP - ab/V2 = RT

PV2/b + a/b - PV - a/V = RTV/b

Dimensions of a/b is same as Dimensions of PV

Do Calculations....

Best of Luck !