5) The diffusivity coefficient of a substance can be calculated from Fick's Law and is represented in the following equation: D=Doexp[1.987E] D= diffusion coefficient, [cm2/s] Do = maximum diffusion coefficient E= activation energy of diffusion, [cal/g-mole] T= absolute temperature, [K] 1) What are the units of D0 and the constant 1.987 ? Justify your answer. 2) Derive an equation for D[in2/s] where T and E can be entered in R and Btu/lb-mole, respectively. 3) What is the maximum diffusion coefficient D0 for aD=2in2/s,E=1,000Btu/lb-mole