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$Δ U = 0$ for combustion of ${CH}_{4} (g)$ in a sealed rigid adiabatic container.

$Δ H_{f}$ for S(monoclinic) is non-zero

If heat of atomisation of ${CH}_{4} (g)$ is 360 kcal/mole and $C - C$ bond energy is 60 kcal/mole then heat of atomisation of $C_{2} H_{6}$ is 600 kcal/mole

Work done may be zero in cyclic process

answer is A.

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Detailed Solution

$Δ_{f} H^{\circ} (S,$ monolithic $\equiv 0$ becasue it is not element of sulpur S.

$ΔE = 0$ for combustion of $C_{2} H_{6} (g)$ in a sealed rigid adiabatic box as in adiabatic process energy exchange = zero.

For $C_{2} H_{6} (g)$ ,

${BE}_{C - C} = 2812 - 6 \times {BE}_{C - H} = 2812 - 6 \times 1656 / 4 = 328 kJ / mol$

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