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B
ΔU−2RT
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C
ΔU−RT
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D
ΔU+RT
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Solution
The correct option is CΔU−RT We know, ΔH=ΔU+ΔngRT where ΔH = change in enthalpy of the reaction ΔU = Change in internal energy Δng = difference in gaseous moles of products and reactants = 2−3=−1 so, ΔH = ΔU−RT