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For combustion of carbon $∆ H = ∆ U$

$Δ_{f} H^{o}$ (S, monoclinic) ≠ 0

If dissociation energy of $C H_{4} (g)$ is 1656 kJ/mol and $C_{2} H_{6} (g)$ is 2812 kJ/mol, then value of C – C bond energy will be 328 kJ/mol

If $Δ H_{f} (H_{2} O, g) = - 242 k J / m o l; Δ H_{v a p} (H_{2} O, l) = 44 k J / m o l$

$t h e n, Δ_{f} H^{o} (O H^{-}, a q .) w i l l b e - 142 k J / m o l$

answer is A, B, C.

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Detailed Solution

a) $∆ E = q + w = 0 + 0 = 0$

b) $(∆ H_{f}^{o}) C S_{(R)} = 0$

c) $C - C - 2812 - 6 X \frac{1656}{4} = 328$

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