Problems:

6.9 c,d

6.13 a,d,e

6.15 b,e

6.24

Answers:

6.9:	No answers will be given.
6.13:	(a) delta-s-bar = 7.037 kJ/kmolK;   delta-s-bar = 7.043 kJ/kmolK (d) delta-s-bar = 7.565 kJ/kmolK;   delta-s-bar = 7.561 kJ/kmolK (e) delta-s-bar = - 23.46 kJ/kmolK;   delta-s-bar = - 23.50 kJ/kmolK
6.15:	(b) p2 = 6.896 bars (e) v2 = 0.1888 m3/kg
6.24:	1Q2 = - 2391.8 kJ 1W2 = - 471.5 kJ

Hints:

No hints at this time..., but you should always FIND THE PHASE if it is not given to you in the problem...
AND -- sometimes either a p-v plot or a T-s plot can come in handy...

Please Remember:

• PLEASE try to be organized.