don=ComdT=dE + pdy dE=c V,mdi IT pdv=RdT 可得定压摩尔热容和定体摩尔热容的关系 P, m =C m +R ◆摩尔热容比 r=Cpm/Cv.m p(V2-V1)=xR(72-7) Q.mCpm(2-1)E2-E1=Cvm(72-7)dQp = Cp,mdT = dE + pdV pdV = RdT Cp,m = CV,m + R dE = CV ,mdT 可得定压摩尔热容和定体摩尔热容的关系 ( ) W = p V2 −V1 ( ) R T2 T1 M m = − ( ) 2 1 C ,m T2 T1 M m C ,m (T2 T1 ), E − E = V − M m Qp = p − 摩尔热容比 = Cp,m CV,m 