In the cylinders of a steam engine, superheated vapor is compressed reversibly from 300 kPa and 460 K to 500 kPa. Calculate the work per unit mass if the process is 

(a) Adiabatic 

(b) Isothermal. For each case, sketch the process on P–V and T–s diagrams, showing the vapor dome. On the P–V diagram, include constant temperature curves through the initial and final states. On the T–s diagram, include constant-pressure curves through the initial and final states. Which process requires more work to compress the steam?