What is the specific entropy of a VLE system composed of water at P = 0.5 MPa with q = 0.65?
A. 5.1 kJ/kg•K
B. 5.6 kJ/kg•K
C. 3.6 kJ/kg•K
D. 5.0 kJ/kg
E. Insufficient information; T is needed.
A. Correct. Specific entropy of a multiphase mixture with one component is calculated using the specific entropies of the two phases and the quality. This is the same way the specific internal energy or the specific enthalpy of a mixture is calculated.
B. Incorrect. You likely did not use the definition of quality correctly. Check your algebra and arithmetic.
C. Incorrect. You have probably reversed the definition of quality in your algebra. This would be the specific entropy for a 65 % liquid VLE system at 0.5 MPa.
D. Incorrect. The units are wrong; specific entropy is energy per mass-absolute temperature.
E. Incorrect. You do not need the temperature explicitly because you are told it is saturated; there is only one temperature it could have at this pressure.
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