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Question

The heat of combustion of benzene is −3264kJmol−1. The heat evolved in the combustion of 39g of benzene will be

A
1623kJ
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B
2623kJ
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C
162kJ
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D
None of these
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Solution

The correct option is D None of these
Molecular Mass of Benzene (C6H6) = 78gmol1
Number of moles of benzene in 39g = 0.5
Given that the heat of combustion of benzene is 3264kJ/mol
The heat releases when 39g of benzene is combusted is 3264×0.5kJ = 1632kJ.
Hence option D is the right answer.

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