Answer
-51 J
Work Step by Step
$\Delta V= 0.50\,L=0.50\times10^{-3}\,m^{3}$
$P=1.0\,atm=101325\,Pa=101325\,N/m^{2}$
$w= -P\Delta V=-101325\frac{N}{m^{2}}\times0.50\times10^{-3}m^{3}=-51\,J$
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