The work (kJ) required to compress 2,400 L of an ideal gas to 400 L at a constant pressure of 120 kPa in a closed system is most nearly:

The work required to compress an ideal gas in a closed system under constant pressure is $W = \Delta V *p$, where $W$ is the work, $\Delta V$ is the change in volume, and $p$ is the pressure at which the gas is being compressed. Also to note that $1 L*1 kPa = 1 J$.

Applying this formula to the values we have:

 $$\begin{gathered} W =\Delta V * p \\ = (2400 - 400) *120 \\ = 2000 *120 = 240000 J \\ = 240 kJ \end{gathered}$$