For the reaction of the ammonium ion with nitrous acid, the net reaction is NH4+(aq) + HNO2(aq) → N2(g) + 2H2O(l) + H+(aq) If the initial concentration of nitrous acid is 1.00 M and, after 35.4 s has elapsed, the concentration of nitrous acid has fallen to 0.64 M, what is the average rate of the reaction over this time interval?

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