a. Compute the maximum useful work that can be obtained when 1 kg of steam undergoes a closed system change of state from 30 bar and 600^◦C to 5 bar and 300^◦C when the atmospheric conditions are 1.013 bar and 298.15 K. 

b. Compute the maximum useful work that can be obtained when 1 kg of steam undergoes a closed system change of state from 30 bar and 600^◦C to 5 bar and 300^◦C when the atmospheric conditions are 1.013 bar and 298.15 K.