15. Determine the temperature dependence of the thermal effect of the reaction 0.5H2 0.5Cl2=HCl at constant pressure, if at 25 C it is equal to -92.3 kJ/mol. Calculate the thermal effect of this reaction at 1000 C. The molar heat capacities at constant volume have the following values:
CvCl2=28.38 1.05*10-3T-2.52*105T-2 J/(mol*K)
CvH2=18.97 3.26*10-3T 0.502*105T-2 J/(mol*K)
CvHCl=18.22 4.6*10-3T 1.09*105T-2 J/(mol*K)

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