After 60 s there are 0.84 mol B in the flask. The decrease in the number of moles of A from t1 = 0 to t2 = 20 s is greater than that for t1 = 40 to t2 = 60 s. The average rate for the reaction from t1 = 40 to t2 = 60 s is 7.0×10−3 M/s.

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