In an air-carbon dioxide mixture in a tube of diameter 10 cm at 298 K and 202.6 kPa, the partial pressure of CO2 at two planes 3 mm apart are 30.4 and 50.6 KPa respectively. The diffusivity of CO2 in air at 298 K and 202.6 kPa is 8.2*10 m 2 /s Calculate the rate of transfer of CO2 across the two planes, assuming: a. Equimolecular counter diffusion. b. Diffusion of CO2 through a stagnant air layer. c. In case 4a) what is the diffusion of coin moles per minute. 4+4+21