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Table 15
Standard free energy of formation (Kcal/mole)

Compound

DG0f

Compound

DG0f

H2O (g)

-54.64

CO (g)

-32.81

H2O (l)

-56.69

CO2 (g)

-94.26

HF (g)

-64.7

NO (g)

+20.72

HCl (g)

-22.77

NO2 (g)

+12.39

HBr (g)

-12.77

CaO(s)

-144.4

HI (g)

+0.31

Ca(OH) 2 (s)

-214.33

NH3 (g)

-3.98

O2 (g)

0

SO2 (g)

-71.79

S (s)

0


Based on the above standard free energies, the free energy change of a chemical reaction may be calculated.

Example : 2NO (g) + O2 (g) NO2 (g)

DG reaction = DG products - DG reactants

= + 12.39 - ( 20.72 + 0 )

= - 8.33 K Cal

which indicates that the reaction occurs spontaneously.

Index

10.1 Introduction
10.2 First Law of Thermodynamics
10.3 Enthalpy
10.4 Second Law of Thermodynamics
10.5 Gibb's Free Energy
10.6 Absolute Entropies

Chapter 11





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