One mole of an ideal gas at 350 K is in a 2.0 L vessel of thermally conducting walls, which are in contact with the surroundings. It undergoes isothermal reversible expansion from 2.0 L to 3.0 L against a constant pressure of 4 atm. The change in entropy of the surroundings (ΔS) is_________ JK–1 (Nearest integer) Given: R = 8.314 J K–1 mol–1 

Answer: 3
Solution:
The first law of thermodynamics for isothermal process, Q = –W
The Work done(W) for isothermal reversible process is

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