Question: A gas is to be expanded from initial state i to final state f along either path 1 or path 2 on a p-V diagram. Path 1 consists of three steps: an isothermal expansion (work is 36 J in magnitude), an adiabatic expansion (work is 19 J in magnitude), and another isothermal expansion (work is 26 J in magnitude). Path 2 consists of two steps: a pressure reduction at constant volume and an expansion at constant pressure.
Part A: What is the change in the internal energy of the gas along path 2?
I need help to find the change in the internal energy of the gas along path 2.