. An ideal gas has CP* = 5R. I enters an adiabatic valve at P = 0.5 MPa and T = 400 K and a flowrate of 10 mol/s. If the exiting pressure is 0.1 MPa, what is the rate at which entropy is generated in the valve?
A. 134 J/K
B. -13.4 J/mol•K
C. 149 J/K•s
D. 134 J/K•s
E. Insufficient information to solve
A. Incorrect. You are losing your units in your work. Redo it and be careful to track them throughout.
B. Incorrect. Entropy generation cannot be negative.
C. Incorrect. Reread the problem statement and make sure you are using the correct pressures.
D. Correct. These are the correct units for rate of entropy generation.
E. Incorrect. This problem is solvable as stated.
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