4. ΔU? of combustion of methane is – X kJ mol–1. The value of ΔH? is
(i) = ΔU?
(ii) > ΔU?
(iii) < ΔU?
(iv) = 0
4. ΔU? of combustion of methane is – X kJ mol–1. The value of ΔH? is
(i) = ΔU?
(ii) > ΔU?
(iii) < ΔU?
(iv) = 0
4.The chemical equation for the combustion reaction is:
CH4 (g) + 2O2 (g) →CO2 (g) + 2H2O (l)
Δng= 1 – 3 = -2
ΔH? = ΔU? + ΔngRT = ΔU? - 2RT
Therefore, ΔH? <ΔU?
i.e. option (iii) is correct.
Upvote 
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Chemistry Ncert Solutions Class 11th 2023
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