Published by:
CGP EDU Academic Team
Published on: August 14, 2026
For water Δ vap H = 41 kJ mol −1 at 373 K and bar pressure. Assuming that water vapour is an ideal gas thatoccupies a much larger volume than liquid water, the internal energy change during evaporation of water is____ kJmol −1 [Use : R = 8.3 J mol −1 K −1 ]
Text Solution
Verified by ExpertsThe correct answer is:
38
(38)
Given equation is
From the reaction : 
⇒ DU = 41 − 3.0959
= 38 kJ/mol
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