When oxygen is bubbled through a high temperature batch of A-containing liquid material, A oxidizes slowly to give a slowly decomposing intermediate X and final product R. Here are the results of an experiment

We have no way of analyzing for X; however, we are safe in assuming that at any time C_A + C_R + C_X = C_Ao. What can we say about the mechanism and kinetics of this oxidation?

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t, min 0 0.1 2.5 5 7.5 10 20 cc Ca, mol/m3 100 95.8 35 12 4.0 1.5 negligible 0 Cr, mol/m3 0 1.4 26 41 52 60 80 100