1.8 moles of an ideal gas at temperature 293 K are contained in a cylinder whose lid is a movable piston. On top of the piston, there are two 1 kg weights. You remove one of the weights, which causes that gas to expand. Throughout this process, the temperature of the gas is held constant. How much work (in kJ) does the gas perform on the environment in this expansion? You can assume that other than the weights, nothing else is pushing down on the gas (there is no air pressure). (Round your answer to the nearest tenth. For example, 12.34 kJ would be entered as 12.3)