Carbon dioxide is being scrubbed out of a gas using water flowing through a

packed bed of 1 cm Berl saddles. The carbon dioxide is absorbed at a rate of 2.3x10-6

mol/cm sec. The carbon dioxide is present at a partial pressure of 10 atm, the Henry's

law coefficient H is 600 atms, and the diffusion coefficient of carbon dioxide in water

is 1.9 x 10-5 cm/sec.

1. Find the film thickness
2. What is the contact time for the carbon dioxide scrubber
3. What is the surface residence time for the carbon dioxide scrubber