A 125 μm film of rubber having an area of 0.6 m2 separates air from pure O2, with both gases at 1 atm and 298K. If oxygen has a diffusion coefficient in rubber of 0.21 × 10-9 m2 /s, calculate the mass flowrate (mg/min) of oxygen through the surface. Plot the concentration profile as a function of z. (cA vs. z, where A = O2).

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound