A certain piston assembly contains a certain gas inside. The gas is to be compressed in a series of processes: Process 1: From 160 L to 140 L using an external pressure of 46 atm Process 2: From 140 L to 120 L using an external pressure of 40 atm Process 3: From 120 L to 100 L using an external pressure of 35 atm Process 4: From 100 L to 80 L using an external pressure of 30 atm Process 5: From 80 L to 60 L using an external pressure of 25 atm Determine the net work for the whole process (in kJ)

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