Evaluating as of ideal gas ds T dv Tds du pdv Tds dh vdp dh ds T dp For ideal gas: du =c(T)dT dh cp(T)dT PU-RT ds cuT) dv +R rs）-I.=cmg+Rn 2 dT P2 -R inp ds =cnT) dp R s.P四-TpN=c以T Pi weanesaay,April 12,2017 12Wednesday, April 12, 2017 12 Evaluating ∆s of ideal gas For ideal gas: