20. Consider the following hypothetical reaction: A +B Calculate the average rate of the reaction on the basis of the following informa tion: a) Pure A and B are mixed, and after 12.0 minutes the measured concentra- tion of C is 0.396 mol/L. b) Pure A, B, and C are mixed together at equal concentrations of 0.300 M After 8.00 minutes, the concentration of C is found to be 0.455 M. 21. Use energy diagrams to compare catalyzed and uncatalyzed reactions.

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