Physical Chemistry Third Edition

1212 A Tables of Numerical Data

Table A.6 Molar Heat Capacities

Gases

CP,ma+bT+cT−^2

(Applicable between 298 K and 2000 K)

Substance a/JK−^1 mol−^1 b× 103 /JK−^2 mol−^1 c× 10 −^5 /J K mol−^1

H 2 27. 33. 30. 50

O 2 30. 04. 18 − 1. 67

N 2 28. 63. 8 − 0. 50

CO 28. 44. 1 − 0. 46

CO 2 44. 28. 79 − 8. 62

H 2 O30. 510. 30

CH 4 23. 647. 86 − 1. 8

Liquids

Substance T/K CP,m/JK−^1 mol−^1

H 2 O 273 − 373 75. 48

CO 80 60. 7

C 2 H 6 100 68. 6

Hg 234 28. 286

Solids

Substance T/K CP,m/JK−^1 mol−^1

H 2 O 273 37. 15

Hg 234 28. 274

Cu 1357 31. 0

Zn 693 29. 7

Sn 505 30. 5

From K. S. Pitzer and L. Brewer,Thermodynamics, McGraw-Hill, New York, 1961, pp. 63, 66.

Table A.7 Specific Enthalpy Changes of Fusion and Vaporization

Substance M.P./◦C ∆fusHm/Jg−^1 B.P./◦C ∆vapHm/Jg−^1

Ammonia 66. 7 − 33. 35 1372

Benzene 5. 5 127 80. 1 394

Carbon dioxide −56.6a 180. 7 −78.5b 526. 6

Carbon monoxide − 199 29. 8 − 191. 5 240. 98

Carbon tetrachloride − 22. 99 17. 576. 54 207. 5

Ethane − 183. 395. 10 − 88. 6 520. 32

Ethanol − 117. 3 109. 078. 5 878. 58

Methane − 182 58. 41 − 164 555. 19

Water 0. 0 333. 5 100. 0 2257. 5

From R. C. Weast,Handbook of Chemistry and Physics, 64th ed., CRC Press, Boca Raton, FL, 1983,

pp. B227ff, C691ff.

aAt 5.2 atm pressure.

bSublimation temperature at 1.000 atm pressure.