1. Spherical solid particles containing B are roasted isothermally in an oven with gas of constant composition. Solids are converted to a firm nonflaking product according to the SCM as follows: A (9) +B(s) - R ($) + s(s) CA = 0.01 kmol PB = 20 kmol/m3 m3 From the following conversion data (by chemical analysis) or core size data (by slicing and measuring) determine the rate controlling mechanism for the transformation of solid. dp. mm s t, minii) dp, mm t. min 1 1 1 0.3 2 1.5 1 6 2.09 0.75 5