Answer
$136\,J\,mol^{-1}K^{-1}$
Work Step by Step
Molar heat capacity=
$1.74\,J\,g^{-1}K^{-1}\times \frac{78.11\,g\,C_{6}H_{6}}{1\,mol\,C_{6}H_{6}}$
$= 136\,J\,mol^{-1}K^{-1}$
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