Type: Multiple Correct answers
The heat evolved in the combustion of benzene is given by
C₆H₆(l)+15/2O₂(g)----------->3H₂O(l)+6CO₂(g)
∆H=-781.0kcal mol^-1When 156 g of C₆H₆ is burnt in an open container the amount of heat energy released will be
a)150.2 kcal mol^-1 b)1562.0 kcal mol^-1
c)6528.2 kJ mol-1^-1 d)2448.5 kJ mol^-1

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Solution

atomic weight of 1 mol of C6H6 = 78g..
Therefore COmbustion of 1 mol produces 781 kcal/mol of heat .

Given 156g => 2 mols of C6H6

Therefore combustion of 2 mols gives 781 x 2 = 1562 kcal/mol..Option (B)

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