A piston-cylinder device initially contains 0.8 kg of O2 at 100 kPa and 27oC. It is now

Question:

A piston-cylinder device initially contains 0.8 kg of O2 at 100 kPa and 27oC. It is now compressed in a polytrophic process (pV1.3 = constant) to half the original volume. Determine
(a) The change of entropy for the system.
(b) Entropy transfer to the surroundings (at 27oC).
(c) The entropy generated in the system's universe due to this process.