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l cal heat and 1 kcal heat...

l cal heat and 1 kcal heat

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Heat of combustion of A(s) is -10" kcal mol"^(-1) and that of B is -"15 kcal mol"^(-1) . On combustion of 3 mol of A and x mol of B , the heat released "105 kcal " . What is the value of x ?

The heat of combustion at constant volume at 27^(@)C of benzene and acetylene are -800 kcal and 310 kcal . Find the heat of polymerisation of acetylene to benzene at constant pressure.