A tank is constructed as a cylinder surmounted by a frustum of a cone. The tank is filled in the cylindrical section with 1-butanol. On a hot day of about 30C and normal atmospheric conditions, the lid was left uncapped so that n-hexane evaporates at steady state. The diameter of the cylindrical part is 1.25 m and the opening is 0.30 m. The height of the frustum of the cone is 0.75 m.

a. Estimate the diffusivity of 1-butanol in air using the Chapman-Enskog Equation and the Fuller et al. Method.

b.Using the value determined by the Chapman-Enskog Equation, determine the mass flux of 1-butanol leaving the opening of the tank.

c. Determine the loss of I-butanol in Kg day.