On the left edge of a 0.50 mm thick film is water with ethanol with an ethanol concentration of 600 kg/m3. On the right edge of the film, the ethanol concentration is 750 kg/m3. The diffusivity of ethanol in water is 0.80 x 10-5 cm2/s. The diffusion of the ethanol is steady.

a. Draw a diagram that plots the concentrations and shows the direction of the ethanol diffusional flux.

b. What are the diffusional and total fluxes of ethanol?

c. What are the diffusional and total fluxes of the water? Draw the diffusional flux of water on the diagram. What will the shape of the water concentration profile be?