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On burning hydrogen in an atmosphere of chlorine, 1.65 gm of HC1 was obtained and 1 Kcal of heat was liberated. The heat of formation of HC1 should be ?

A. -21.12 Kcal mol-1

B. -44.2 Kcal mol-1

C. 500 cal mol-1

D. 500 cal gm-1

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