2. Before the start of the reaction, 1 liter of the solution contained 35.35 g of Na2S2O3 and 18.25 g of CH3I. After 10 minutes, the amount of sodium thiosulfate decreased to 27 g, and CH3I - to 9.9 g and after 20 minutes to 23.2 and 6.1 g, respectively. Show that this is a second order reaction.

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