For number 40 on the homework, can we assume that the system is isochoric because in the book it says that for a steady state process, the mass and entropy of the fluid in the control volume is constant. Are we allowed to use isochoric equations to solve for q of the process?
You could use the equations for an isochoric process only if the volume per mole of the fluid stays the same throughout the process, not the control volume. Thus, if the conditions indicated suggest a constant volume per mol of the flowing streams, you can use isochoric expressions. If not, you will need to use more general expressions.
MSS
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