See the answer below.
Work Step by Step
a) $W=-P\Delta V$ $W=-101\ kPa\times -22.4\ L\div 1000\ L/m^3=2.26\ kJ$ b)$\Delta H= \Delta U +P\Delta V=\Delta U-W$ $\Delta U=-483.6\ kJ+2.26\ kJ$ $\Delta U=-481.3\ kJ$
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