The following is a set-up to determine the diffusion coefficient of a solute (A) in a liquid (B). The transfer of A is from the bottom to the top compartment. V is the volume of the compartments and they are equal, c is concentration of A, σ is the porosity of the membrane between two compartments, z is the thickness of the membrane. Derive the equation for the diffusion coefficient of A in B (DAB)

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?