1 mole of an ideal gas a(Cv,m=3R) and 2 moles of anideal gasB are {Cv,m=3/2R}taken in a container and expanded reversible and adiabaticallyfrom 1 litre to 4 litre starting from initial temperatureof 320K.find change in internal energy?

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We know that In adiabatic expansiondw=dupdv=nCv dt(p1+p2)dV=nCv1dt+nCv2dt(n1RT+n2RT2)dV/V=n1Cv1dt+n2Cv2dtRT(dV/V)=(Cv1+Cv2)dtln (T2/T1)=1/2ln (v1/v2)