CHEM 4010                                                                                      Spring, 2008

 

 

   

Use the following data to calculate the standard entropy of gaseous SO2  at 298 K: DHfus = 7.4015 kJ/mol at the melting point of 197.64 K, and DHvap = 24.937 kJ/mol at the boiling point of 263.08 K.  Assume that the heat capacity of the liquid is constant at 87.08 J K-1 mol-1, and that the heat capacity of the gas is constant at 39.87 J K-1mol-1.  The heat capacity of the solid 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

15

3.4727

20

6.9454

25

11.4642

30

15.8574

35

20.2924

40

24.1835

45

27.6562

50

30.7942

55

33.5557

60

36.0661

70

40.0409

80

43.1789

90

45.7311

100

48.0742

110

50.0825

120

51.8816

130

53.6807

140

55.6890

150

57.8229

160

59.9567

170

62.1324

180

64.5173

190

67.0277

197.63

68.94