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CGP EDU Academic Team
Published on: August 14, 2026
A certain mass of gas is expanded from (1L, 10 atm) to (4L, 5 atm) against a constant external pressure of 1 atm. If initial temperature of gas is 300 K and the heat capacity of process is 50 J/°C. Then the enthalpy change during the process is (1L atm ~ 100 J)
Text Solution
Verified by ExpertsThe correct answer is:
B
State 1 
State 2
(1 L, 10 atm, 300 K) (4L, 5 atm, 600 K)
Heat given, q = 50 ´ (600 – 300) = 15000 J
W = – P ext (V 2 – V 1 ) = – 1 (4–1) = – 3 L atm = – 300 J
Δ E = q + W = 15000 – 300 = 14700 J
Δ H = Δ E + P 2 V 2 – P 1 V 1 = 14700 J + (20 – 10) × 100 J = 15.7 KJ
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