CHAPTER 12 EQUILIBRIUM CONDITIONS IN MULTICOMPONENT SYSTEMS
12.1 EFFECTS OFTEMPERATURE 367
For a pure substance in a closed system, Eq.12.1.3when multiplied by the amountn
becomes
@ .G=T /
@T
p
D
H
T^2
(12.1.4)
This is theGibbs–Helmholtz equation.
12.1.2 Variation ofi=Twith temperature
If we make the substitutioniDiCRTlnaiin Eq.12.1.3and rearrange, we obtain
d.i=T /
dT
D
Hi
T^2