A rigid vessel initially contains saturated steam at P = 0.2 MPa. Heat is added until the pressure is 0.3 MPa. Determine the amount of heat added per kilogram of steam, and the change in specific entropy of the gas.
A. 3963 kJ/kg and 0.5751 kJ/kg•K
B. 277 kJ/kg and 0.5751 kJ/kg•K
C. 287 kJ/kg and 0.5971 kJ/kg•K
D. 14.1 kJ/kg and 0.5971 kJ/kg•K
E. Insufficient information to solve
A. Incorrect. This is a closed system so you cannot use enthalpy here.
B. Incorrect. Even though the specific volume at 0.3 MPa and 573.15 K is close, you still should interpolate to get the correct value. (Numerous online sites can be used to simplify the process.)
C. Correct. This problem is calculationally simple, but requires a good conceptual memory.
D. Incorrect. You cannot assume the steam is saturated at the end of the heating.
E. Incorrect. Enough data is present to provide a solution method.
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