AIPMT PRELIMS2000Physics-Thermodynamics
AIPMT PRELIMS 2000 Physics Enthalpy and Internal Energy MCQ Question
Type: MCQ-conceptual-Medium-Class 11
For the reaction C₂H₅OH(ℓ) + 3O₂(g) → 2CO₂(g) + 3H₂O(ℓ) which one is true :
A
ΔH = ΔE – RT
B
ΔH = ΔE + RT
C
ΔH = ΔE + 2RT
D
ΔH = ΔE – 2RT
Correct Answer
Option A
Detailed Explanation
For reactions involving gases, ΔH = ΔE + ΔnRT. Here, Δn = 2 - 4 = -2, so ΔH = ΔE - 2RT.
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