Solve Thermodynamics Problem: Q12, W12, W21 & Entropy Change

[ashkash]

Homework Statement

A closed system contains 3 kg of R-134a at 10 °C and 90 kPa (state 1), and undergoes an internally reversible, isothermal process until the volume of the R-134a reaches 0.056 m3 (state 2). The system returns to state 1 by an irreversible process and the heat transfer for the return process is +3.2 kJ. Determine Q12, W12, W21 and the entropy change for each process.

Homework Equations

The Attempt at a Solution

I do not know how to go about doing this. Any help will be appreciated. thanks.

 

[teknodude]

Start out by drawing an T-s, P-V, and T-V diagram, to better see the cycle