CHEM 4010                                                                                                  Spring, 2008

  

Use the following data (all obtained at 1 bar pressure) to calculate the standard entropy of liquid benzene at 298.15 K:  Dfus H = 10.56 kJ mol-1 at  the melting point of 278.69 K. Assume that the heat capacity of the liquid has a constant value of 136.1 J K-1 mol-1.  The heat capacity of solid benzene, at 1 bar,  is given as a function of temperature below.  Compare your result with the value given in Table 2.7 of the Textbook.

T/K

Cp,m/J K-1 mol-1

13

2.866

14

3.473

15

4.167

20

8.368

25

13.159

30

17.991

35

22.531

40

26.527

50

32.991

60

37.928

70

41.735

80

44.978

90

47.823

100

50.417

120

55.689

140

61.505

160

67.906

180

75.396

200

83.722

220

93.387

240

104.098

260

116.148

278.69

128.700