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Difference between Internal Energy and Enthalpy

The heat of c...

Question

The heat of combustion of benzene is $- 3264 k J m o l^{- 1}$ . The heat evolved in the combustion of $39 g$ of benzene will be

1623 k J

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2623 k J

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162 k J

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None of these

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Solution

The correct option is D None of these
Molecular Mass of Benzene ( $C_{6} H_{6}$ ) = $78 g m o l^{- 1}$
Number of moles of benzene in $39 g$ = $0.5$
Given that the heat of combustion of benzene is $- 3264 k J / m o l$
The heat releases when $39 g$ of benzene is combusted is $3264 \times 0.5 k J$ = $1632 k J$ .
Hence option D is the right answer.

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