Answer
$-2.8\times10^{2}\,J$
Work Step by Step
$w=-P\Delta V= -1.1\,atm\times(2.5-0.0)L=-2.75\,atm\,L$
$=-2.75\,atm\,L\times\frac{10^{-3}m^3}{1 L}\times\frac{101325\,Pa}{1\,atm}\times\frac{1\,N/m^2}{1\,Pa}=-2.8\times10^{2}\,Nm=-2.8\times10^{2}\,J$