Chemical Thermodynamics Part 2

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 4‌atm. The change in entropy of the surroundings (∆S) is _______ JK−1 (Nearest integer)
Given: R=8.314JK−1mol−1