I have a quiz tomorrow and I hope somebody sees this and answers in time. Alright, so I have superheated steam at 8600kPa and 500 degrees C. It expands isentropically to 2900 kPa. Since it's isentropic, S2 must be equal to S3, assuming it's ideal. S2 = S3' = 6.6858. Getting the saturation entropies at 2900 kPa, Sl = 2.6283 and Sv = 6.1969. x is 1.13. Now this is the problem; it's still superheated. How on earth do I get enthalpy (H) 3? I've been looking at the freaking steam table for three hours with no luck. apparently the answer is 3071 and I have no idea how did they even get that. Thanks.