1. Before the start of the reaction, the solution contained 35.35 mg Na2S2O3 and 18.25 mg CH3I. After 10 min, the amount of Na2S2O3 decreased to 27 mg, and CH3I to 9.9 mg, after 20 min, to 23.2 and 6.1 mg, respectively. Show that the reaction proceeds in second order.

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