A sphere of lemon scent (diameter: 25.4 mm) is suspended in an air stream at atmospheric pressure and 40 oC, and flowing at a velocity of 0.415 m/s. Calculate (a) (a) flux and (b) mass transfer rate of lemon scent. The diffusivity of the scent in air is 6.92 x 10-6 m2/s and the vapor pressure of the scent is 90 Pa. The viscosity and density of air is 1.93 x 10-5 Pa.s and 1.113 kg/m3.