Chapter 9, Problem 9.131CP

Used in welding metals, the reaction of acetylene with oxygen has

$\Delta H°$ = -1256.2 kJ:

${\text{C}}_{\text{2}}{\text{H}}_{\text{2}}(g)+\text{5}/{\text{2O}}_{\text{2}}(g)\to {\text{H}}_{\text{2}}\text{O}(g)+\text{2}C{O}_2(g)$

$\Delta H°$ = -1256.2 kJ

How much PV work is done in kilojoules and what is the value of $\Delta E$ in kilojoules for the reaction of 6.50 g of acetylene at atmospheric pressure if the volume change is -2.80 L?