A spherical ball of benzoic acid (diameter = 1.5 cm) is submerged in a pool of still water. The solubility and diffusivity of benzoic acid in water are 0.03 kmol/m3 and 1.25 x 10-9 m2/srespectively. Sherwood number is given as Sh = 2.0 + 0.6 0.5 0.33 Re Sc . The initial rate of dissolution (in kmol/s) of benzoic acid approximately is