The first-order rate constant for the decomposition of N_{2}O_{5},

2N_{2}O_{5}(g) → 4NO_{2}(g) + O_{2}(g)

at 70^{o}C is 6.82 x 10^{ - 3} s^{ - 1}. Suppose we start with 2.60×10^{−2} mol of N_{2}O_{5}(g) in a volume of 2.1 L .

How many minutes will it take for the quantity of N_{2}O_{5} to drop to 1.8×10^{−2} mol ?

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