AIPMT PRELIMS2003Chemistry-Thermodynamics
AIPMT PRELIMS 2003 Chemistry Enthalpy and Internal Energy MCQ Question
Type: MCQ-numerical-Medium-Class 11
For the reaction : C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(ℓ) at constant temperature, ΔH – ΔE is :
A
+RT
B
– 3RT
C
+3RT
D
– RT
Correct Answer
Option B
Detailed Explanation
ΔH – ΔE = ΔnRT, where Δn is the change in moles of gas. Here, Δn = (3 + 4) - (1 + 5) = 1. Therefore, ΔH – ΔE = – 3RT.
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