4. Under normal conditions, gaseous nitrogen behaves as an ideal gas. The mass of the gas is 0.1 kg. Find the work of expansion, the amount of heat, and the change in internal energy during the following processes:
a) isothermal expansion to a volume of 0.2 m3.
b) isobaric expansion to a volume of 0.2 m3
c) isochoric heating to a pressure of 2 atm.

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