Air at \(373 \mathrm{~K}\) and \(2 \mathrm{~atm}\) is passed through a bed \(10 \mathrm{~cm}\) in diameter composed of iodine spheres \(0.7 \mathrm{~cm}\) in diameter. The air flows at a rate of \(2 \mathrm{~m} / \mathrm{s}\), based on the empty cross section of the bed. The porosity of the bed is \(40 \%\).

(a) How much iodine will evaporate from a bed \(0.1 \mathrm{~m}\) long? The vapor pressure of iodine at \(373 \mathrm{~K}\) is \(6 \mathrm{kPa}\).

b) Estimate the pressure drop through the bed.