Ethanol is diffusing through a 4-mm stagnant film of water. the ethanol concentrations at the entrance and the existing planes are maintained at 0.1 and 0.02 mol/m3, respectively. if the water film temperature is kept constant at 283 k determine the steady-state molar flux of the ethanol and the concentration profile as a function of the position z within the liquid film. compare these results with a 4-mm stagnant film of air at 283 k and 1 atm at the same entrance and exit ethanol concentrations.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

answer; capital earns interest; entrepreneurship receives a profit or incurs a loss;