ΔfU^Θ of formation of CH4 (g) at certain temperature is –393 kJ mol^–1. The value of ΔfH^Θ is
ΔfUΘ of formation of CH4 (g) at certain temperature is –393 kJ mol–1. The value of ΔfHΘ is
(i) zero
(ii) < Δf UΘ
(iii) > Δf UΘ
(iv) equal to Δf UΘ
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