How to get the internal energy?

yecko
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Homework Statement


螢幕快照 2017-10-19 下午10.00.56.png


Homework Equations


螢幕快照 2017-10-19 下午10.52.02.png


The Attempt at a Solution


v2=vf+x*vfg
x =(0.4458-0.001067)/(0.71813-0.001067) =0.61973
u2=uf+x*ufg =535.08+0.61973*(2001.8-535.08) =1444.05kJ/kg ==> far different from solution!

whats wrong with my attempt? thanks
 

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I get a value of vf at the final state of 0.816 rather than 0.718
 
o yes! thanks
 
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