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The enthalpy of combustion of propane, graphite and dihydrogen at 298K are $- 2220.0 k J m o l^{- 1}$ , $- 393.5 k J m o l^{- 1}$ and $- 285.8 k J m o l^{- 1}$ respectively. The magnitude of enthalpy of formation of propane $(C_{3} H_{8})$ is $k J m o l^{- 1}$ . (Nearest integer)

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answer is 104.

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Detailed Solution

$3 C_{(gr)} + 4 H_{2 (g)} \to C_{3} H_{8 (g)}; ∆ H_{f} = - 103.7 kJ {mol}^{- 1} ∆ H_{f} (C_{3} H_{8}) = 3 ∆ H_{c} (graphite) + 4 ∆ H_{c} (H_{2}) - ∆ H_{c} (C_{3} H_{8})$

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