State Functions Contributions by: John L. Falconer & Will Medlin Department of Chemical and Biological Engineering University of Colorado Boulder, CO Supported by the National Science Foundation

Two pathways are shown from points 1 to 2 on the P-T diagram. Point C is the critical point. One pathway has a phase change (dashed line) and the other does not (solid lines). Which pathway has the larger change in enthalpy? A.Solid lines B.Dashed lines C.They are the same C 1 2 P T

Two pathways are shown from point 1 to 2 on the P-T diagram. Point C is the critical point. One pathway has a phase change (dashed line) and the other does not (solid lines). Which pathway has the larger change in entropy? A.Solid lines B.Dashed lines C.They are the same C 1 2 P T

Suppose both adiabatic steps in a Carnot cycle are irreversible. Which is the correct statement about the entropy change of the Carnot engine? A.ΔS engine > 0 B.ΔS engine = 0 C.ΔS engine < 0 D.None of the above

Adsorption is exothermic and desorption is endothermic. To permeate through a zeolite membrane, a component first adsorbs in the zeolite pores, diffuses through the membrane, and then desorbs from the pores. Which overall process has the larger ΔH ? A.pervaporation B.vapor permeation C.the same in both scenarios D.Need more information. Liquid Vapor Pervaporation Zeolite membrane Vapor Vapor Permeation

Adsorption is exothermic and desorption is endothermic. For a component to permeate through a zeolite membrane, it must adsorb first into the zeolite pores, diffuse through the membrane, and then desorb from the pores. For which process is |ΔH abs | larger? A.Adsorption from the liquid phase B.Adsorption from the vapor phase C.Same in both scenarios D.need more information Liquid Vapor Pervaporation Zeolite membrane Vapor Vapor Permeation

Consider two processes: A.Q 1 > Q 2 B.Q 1 < Q 2 C.Q 1 = Q 2 Heat evaporates all the liquid feed Lliquid adsorbs on the membrane, phase diffuses through the membrane, and then desorbs into the gas phase Both systems are isothermal at 60 ° C, and all the liquid evaporates. Which is correct? Membrane Q2Q2 Q1Q1 liquid vapor

The temperature decreases when CO 2 expands adiabatically from high to low pressure. Adsorption is exothermic, desorption is endothermic. Which statement is correct? A.T 1 > T 2 B.T 1 < T 2 C.T 1 = T 2 ToTo T1T1 T2T2 ToTo small nozzle zeolite membrane absorbdesorb

A fluid undergoes adiabatic expansion in a turbine. Which reference state will cause the enthalpy of the outlet stream to be highest? A.Inlet state at ideal gas conditions B.Inlet state at real fluid conditions C.Outlet state at ideal gas conditions D.Same for all reference states