Answer
-0.30 kJ
Work Step by Step
We find:
$\Delta V=50.0\,mL-(50\,mL+50\,mL)=-50.0\,mL=-0.0500\,L$
$P\Delta V=1.5\,atm\times -0.0500\,L=-0.075\,L\,atm$
$=-0.075\,L\,atm\times\frac{101.325\,J}{1\,L\,atm}=-7.6\,J=-7.6\times10^{-3}\,kJ$
$\Delta E=\Delta H-P\Delta V$
$=-0.31\,kJ-(-7.6\times10^{-3}\,kJ)=-0.30\,kJ$
