Mass transfer is occurring from a sphere of naphthalene (Component A) having a radius of 1cm. The sphere is in a large volume of still air (Component B ) at 52.6C and 1atm pressure. The vapor pressure (PA) of naphthalene at 52.6C is 10mmHg. The diffusivity of naphthalene in air at this temperature is 7.02106m2/s. By using shell-balance method, find the concentration profile of naphthalene and calculate the rate of evaporation of naphthalene from the surface in kmol/m2.s. (Ideal gas constant is R=82.06cm3 atm/mol.K, x=P/P,C=P/RT )