Chemistry (M.Phil./Ph.D.) 2017 Panjab University Entrance Exam With Answers

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38.

The heat of reaction 1⁄2 H2 + 1⁄2 Cl2 ------>HCI at 27 C is – 22.1 kcal. Calculate the heat of reaction at 770C. The molar heat capacities at constant pressure at 270C for hydrogen, chlorine and HCl are 6.82, 7.70 and 6.80 cal mol-1 respectively.

A: -27.832 kcal
B: -26.231 kcal
C: -22.123 kcal
D: -21.978 kcal

The answer is: C

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