Chapter 9, Problem 9.61SP

The reaction between hydrogen and oxygen to yield water vap or has $\Delta H°=-484\text{ kJ}\text{.}$ How muchPV work is done, and what is the value of $\Delta E$ in kilojoules for the reaction of0.50 mol of $H_2$ with 0.25 mol of 02 at atmospheric pressure if the volume change is -5.6 L?
$2H_2\left(g\right)+O_2\left(g\right)\to 2H_{2}O\left(g\right)\Delta H°\text{ = -}484\text{ kJ}$