Initial Temperature (T1)=400F=(5/9)(400-32)=204.44 C
If steam is heated at constant volume (in a rigid vessel) to teach critical point(Tc=374C),
From steam table :
At critical point specific volume(v2)=0.003105m3/kg
Therefore specific volume at initial state(v1)=(v2)=0.003105 m3/kg
vf=0.001164 m3/kg, vg=0.11508 m3/kg
Quality of steam(X) at T1=204.44 C is given by
Ans: Quality of steam at T1=4000F is X=0.01711
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How did you get the T2=374C?