Chemical Thermodynamics Part 2

Consider the figure provided.
1‌mol of an ideal gas is kept in a cylinder, fitted with a piston, at the position A, at 18∘C. If the piston is moved to position B, keeping the temperature unchanged, then ' x ' L atm work is done in this reversible process.
x= ______ L atm. (nearest integer)
[Given : Absolute temperature =‌∘C+273.15, R=0.08206L‌atm‌mol−1‌K−1]