One mole of an ideal gas at `350K` is in a `2.0L` 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 surrounding `(Delta S)` is _____`JK^(-1)`(Nearest integer)
Given :`R=8.314JK^(-1) mol_(-1)`