∆fU
of formation of CH4 (g) at certain temperature is –393 kJ/mol. The value of ∆fH
is
(i) zero
(ii) < ∆f U
(iii) > ∆f U
(iv) Equal to ∆fU
∆fU of formation of CH4 (g) at certain temperature is –393 kJ/mol. The value of ∆fH is
(i) zero
(ii) < ∆f U
(iii) > ∆f U
(iv) Equal to ∆fU
-
1 Answer
-
This is a Multiple Choice Questions as classified in NCERT Exemplar
The correct option is B <ΔU
The balanced equation for the combustion of methane is:
CH4 (g)+2O2 (g)→CO2 (g)+2H2O (l)
Here, Δng=1−3=−2
ΔH =ΔU +ΔngRT
ΔH =−393−2RT
∴ΔH <ΔU
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