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.

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced. be sure your answer has the correct number of significant digits.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.