A mass of 0.025 kg of steam at a quality of 10 percent and a pressure of 200 kPa is heated in a rigid container until the temperature reaches 300°C. The pressure at state 2 is nearest:
A) 2.25 MPa
B) 2.5 MPa
C) 2.75 MPa
D) 3.0 MPa
C) 2.75 MPa
We have v2 = v1 = 0.001061+ 0.1×(0.8857 ? 0.001061) = 0.0895 m3/kg and T2 = 300°C.
T = 300°C and v = 0.09 m3/kg, the pressure is very close to 2.25 MPa. (An interpolation is done by sight but could be done more accurately, however, that’s not necessary.)
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