$8-12$ Swabb and Gates $(1972)$ have studied pore$-$diffusion$/$reaction phenomena in crystallites of $H($hydrogen$)-$mordenite catalyst. The crystallites were approximate parallelepipeds, the long dimension of which was assumed to be the pore length. Their analysis was based on straight, parallel pores in an isothermal crystallite $(2$ faces permeable$).$ They measured $($initial$)$ rates of dehydration of methanol $($A$)$ to dimethyl ether in a differential reactor at $101$kPa using catalyst fractions of different sizes. Results $($for two sizes$)$ are given in the table below, together with quantities to be calculated, indicated by $(?).$

$\backslash$table$[[$Catalyst$/$reaction in general:,Value$],[n,$ order of reaction $($assumed$),1],[\frac{T}{}C,205],[\frac{c_{As}}{m}olc{m}^{-3},2\mathrm{.}55{10}^{-5}$