Question

Four kilomoles of a monoatomic idel gas are at a temperature of 300 K. The gas expands reversibly and isothermally to twice its original volume.

1) Sketch the process in the P-V plane.

2) Compute the work done by the gas.

3) Compute the heat supplied to maintain constant temperature. Note U=U(T).

Answer 1

1)
The sketch is given below
2)
Work done by the gas


Now putting the given values, we get
  

3)

And for isothermal process, we have
  
So, the heat suppled