∆fUᶱ of formation of CH4 (g) at certain

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Question:
∆fUᶱ of formation of CH4 (g) at certain temperature is –393 kJ mol–1. The

value of ∆ fHᶱ is

(i) zero

(ii) < ∆f Uᶱ

(iii) > ∆f Uᶱ

(iv) equal to ∆f Uᶱ

Solution:

Option (ii) < ∆f Uᶱ is the answer.

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