One mole of an ideal gas at 350K is in a 2.0 L vessel of thermally conducting walls, which are in contact with the surroundings. It undergoes isothermal reversible expansion from 2.0L to 3.0L against a constant pressure of 4 atm. The change in entropy of the surroundings $(\Delta \mathrm{S})$ is $\_\_\_\_$ J K-1 (Nearest integer) Given : $\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$.