78. When studying the process of isomerization of trans-stilbene (1,2-diphenylethylene) into the cis-isomer in tert-butylbenzene, the following experimental data were obtained:
t, C Kc
100 0.00345
119.5 0.00485
140 0.00692
169.6 0.00993
Calculate the thermal effect of isomerization and the change in entropy of the process at 120 C.

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