The graph in the figure shows a pV diagram for 3.30 moles of ideal helium (He) gas. Part ca of this process is isothermal.
![1979_A pV diagram.jpg](https://secure.tutorsglobe.com/CMSImages/1979_A%20pV%20diagram.jpg)
How much heat entered or left the He during segments ab, bc, and ca?
By how much did the internal energy of the He change from a to b, from b to c, and from c to a?