Perry’s Chemical Engineers’ Handbook, Eighth Edition

Table 2-178: Heats and Free Energies of Formation of Inorganic Compounds (Continued)

Table 2-178: Heats and Free Energies of Formation of Inorganic Compounds ( Continued)

Compound

State [ ]

Heat of formation [ ] [ ] ? H (formation) at 25 C, kcal/mol

Free energy of formation [?] [ ] ? F (formation) at 25 C, kcal/mol

Selenium ( Cont.)

c, II, red, mono-clinic

0.2

Se 2Cl 2

l

22.06

13.73

SeF 6

g

246

2.2

SeO 2

c

56.33

Silicon

Si

c

0.00

0.00

SiBr 4

l

93.0

SiC

c

28

27.4

SiCl 4

l

150.0

133.9

g

142.5

133.0

SiF 4

g

370

3.0

SiH 4

g

14.8

9.4

SiI 4

c

29.8

Si 3N 4

c

179.25

154.74

SiO 2

c, cristobalite,

202.62

1600 form

c, cristobalite,

202.46

1100 form

c, quartz

203.35

190.4

c, tridymite

203.23

Silver

Ag

c

0.00

0.00

AgBr

c

23.90

23.02

Ag 2C 2

c

84.5

AgC 2H 3O 2

c

95.9

aq

91.7

70.86

AgCN

c

33.8

38.70

Ag 2CO 3

c

119.5

103.0

Ag 2C 2O 4

c

158.7

AgCl

c

30.11

25.98

AgF

c

48.7

aq, 400

53.1

47.26