ENTROPY CHANGE IN A PHASE TRANSITION


L = Heat of Vaporization or Fusion during the Phase Transition

Tp = Phase Transition Temperature (Melting or Boiling Point)

Entropy (J/K)
Entropy (Bits)
Entropy/kg (J/kg K)
Entropy/mole (J/mole K)
Entropy/atom (J/atom K)
Entropy/atom (Bits/atom)

ENTROPY of BOILING or EVAPORATION
Substance
Boiling Temp.
Tb (K)
Heat of Vaporization
Lv (cal/gm)
Entropy per kg
S/m (J/kg K)
Entropy per Atom
M S/(R ln2)
(Bits/Atom)
Iodine I 2
457.
23.8
218.09
9.66
Nitrogen N 2
77.4
47.8
2583.15
12.55
Ethyl Ether (C 2H5)2O
307.8
75.2
1021.79
13.14
Oxygen O 2
90.2
51.1
2371.47
13.17
Sulfuric Acid H2SO 4
599.
122.1
853.01
14.52
Zinc
1180.
362.4
1285.13
14.58
Benzene C 6H6
353.3
94.1
1114.37
15.10
Chloroform (CHCl 3)
334.4
59.2
740.20
15.28
Lead
2023.
208.0
430.21
15.47
Mercury
629.8
584.4
3882.14
16.37
Aluminum
2740.
2500.0
3817.52
17.87
Copper
2840.
1145.0
1694.17
18.68
Water
373.2
539.4
6047.79
18.89
At Atmospheric Pressure


ENTROPY of MELTING or FREEZING
Substance
Melting Temp.
Tm (K)
Heat of Fusion
Lf (cal/gm)
Entropy per kg
S/m (J/kg K)
Entropy per Atom
M S/(R ln2)
(Bits/Atom)
Potassium
336.
14.6
181.80
1.23
Sodium
371.
27.4
309.01
1.23
Oxygen O 2
54.4
3.3
253.81
1.41
Iron
1803.
63.7
147.82
1.43
Hydrogen H 2
13.9
13.8
4153.90
1.45
Lead
600.
5.9
41.14
1.48
Silver
1234.
25.0
84.76
1.59
Gold
1336.
15.3
47.92
1.64
Mercury
234.
2.7
48.28
1.68
Lithium
452.
158.5
1467.18
1.77
Nitric Acid HNO 3
226.
9.55
176.80
1.93
Nitrogen N 2
63.2
6.15
407.15
1.98
Aluminum
932
94.5
424.24
1.99
Hydrogen Sulfide H 2S
188
16.8
373.89
2.21
Neon
24.6
3.83
651.41
2.28
Fluorine F 2
53.6
6.4
499.58
3.29
Water H 2O
273.
79.7
1221.48
3.82
Sodium Chloride NaCl
1073.
123.5
481.57
4.88
Acetone CH 3
178
23.4
550.03
5.54
Benzene C 6H6
279.
30.3
454.39
6.16
Carbon Dioxide CO 2
216.
43.2
836.80
6.39
Hydrogen Peroxide H 2O2
271
74.1
1144.04
6.75
Iodine I 2
386.
14.3
155.00
6.83
Chlorine Cl 2
170.
22.8
561.15
6.90
At Atmospheric Pressure