Question 1 Estimate the effective diffusivity of thiophene (molecular weight 84) in hydrogen at 660K and 30 atmospheres in catalysts pellet having an internal surface area of 180 m g, a pellet porosity of 0.4, and a pellet density of 1.4 g/cm. The mutual diffusivity of thiophene in hydrogen is known to be 0.052 cm'sec at 660 K and 30 atmospheres. The tortuosity factor t 4. (Gas constant Rm = 8.314 Jmol K'. Assume volume change in any reaction is zero.