Physics Homework Help: Thermodynamics?

Having a little trouble with this homework problem. I have about half of it finished, but having difficulties with the last two parts: A sample of a monatomic ideal gas occupies 5.00 L at atmospheric pressure and 300 K (point A in the figure below). It is warmed at constant volume to 3.00 atm (point B). Then it is... show more Having a little trouble with this homework problem. I have about half of it finished, but having difficulties with the last two parts:

A sample of a monatomic ideal gas occupies 5.00 L at atmospheric pressure and 300 K (point A in the figure below). It is warmed at constant volume to 3.00 atm (point B). Then it is allowed to expand isothermally to 1.00 atm (point C) and at last compressed isobarically to its original state.

(a) Find the number of moles in the sample.
I found the answer to be: 0.203 moles

(b) Find the temperature at point B.
I found the answer to be: 900K

(c) Find the temperature at point C.
I found the answer to be: 900K

(d) Find the volume at point C.
I found the answer to be 15 L (0.015m^3)

(e) Now consider the processes A → B, B → C, and C → A. Describe how to carry out each process experimentally.