The enthalpy of combustion of propane $(C_{3} H_{8})$ gas in terms of given data is, Bond energy $(kJ / mol)$
$ε_{C - H} ε_{O = 0} ε_{C = O} ε_{O - H} ε_{C - C}$
$+ x_{1} + x_{2} + x_{3} + x_{4} + x_{5}$
[Resonance energy of ${CO}_{2} is - z kJ / mol$ and $Δ H_{vaporization} [H_{2} O (l)] is y kJ / mol]$

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$8 x_{1} + x_{5} + 5 x_{2} - 6 x_{3} - 8 x_{4} - 4 y + 3 z$

$8 x_{1} + 2 x_{5} + 5 x_{2} - 6 x_{3} - 8 x_{4} - 4 y - 3 z$

$8 x_{1} + 2 x_{5} - 6 x_{3} - 8 x_{4} - y - z$

$6 x_{1} + x_{5} + 5 x_{2} - 3 x_{3} - 4 x_{4} - 4 y - 3 z$

answer is A.

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Detailed Solution

The reaction is having follows,

$C_{3} H_{8} (g) + 5 O_{2} (g) ⟶ 3 {CO}_{2} (g) + 4 H_{2} O (l)$

$Δ_{C} H = 2 x_{5} + 8 x_{1} + 5 x_{2} - 4 y - 8 x_{4} - 6 x_{3} - 3 z$

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