PHYSICAL CHEMISTRY IN BRIEF

CHAP. 6: THERMODYNAMICS OF HOMOGENEOUS MIXTURES [CONTENTS] 142

Solution

Since the enthalpy and internal energy of an ideal gas are functions of temperature only [see

3.5.3,3.5.2], we have

Hm•,i(T, p) = Hm◦,i(T, pst),

Um•,i(T, p) = Um◦,i(T, pst),.

The entropy of an ideal gas depends on pressure and for its conversion we write [see3.5.4]

Sm•,i(T, p) =Sm◦,i(T, pst)−Rln

p

pst

.

From the definitions (3.12) and (3.14) we obtain conversion forF andG.