One way to remove rust stains from ceramic bathroom fixtures is to apply a solution of  oxalate ion, as shown in the following equation. C2O4 2(aq) + 2 Fe3(aq) → 2 CO2(g) + 2 Fe2 (aq) What is the average rate of reaction for this system over the specified period if the  concentration of oxalate ion changes from 0.80 mol/L at 3.0 min to 0.20 mol/L at 8.0 min?   (a) . Which of the five factors that affect rate of reaction do so by (b) increasing the collision frequency? (c) increasing the fraction of collisions that are effective?

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