Toluene is evaporating from @ constant T of 315K and 1atm. The beaker Is 0.25 m in heignt and is initially filled with toluene to a depth of 0.2m.

Pure air is blowing across the top of the beaker. The diffusivity of toluene in air is DAB = 0.086 cm2/s at 25.9 C. The vapor pressure of toluene Is P*=64.2 mmHg at 42C.

Q: Determine the molar flux of toluene, NAi, in kgmol/ms2 when the process starts AND the final fIux, NAf, when the last of the toluene evaporates.