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danny:
you know Pf.
If I'm understanding correctly, Adiabatic => Q = 0. Hin = Hout.
You know Hin. You know Pf. Assume exit is saturated steam, I think. Ie. you know Tf from the steam tables. You therefore know the H value of sat. steam. Any extra energy goes to vaporization. All these are specific (molar / mass dependent), so you can work the balance without worrying about mass, or by assuming an arbitrary basis (I might suggest 1 mole or kg, depening on your values in the tables) as our binary friend above states. You've got the extra energy, and you know the heat of vaporization of water. I think you can calculate the fraction from that.
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