The reaction 2NO2 → 2NO + O2 obeys the rate law:
Δ[O2]/Δt = (1.40 x 10 -2 sec) [NO2]2 at 500. K.
If the initial concentration of NO2 is 1.00 M, how long will it take for the [NO 2] to decrease to 14.2% of its initial value?
A) 61.3 s
B) 139 s
C) 432 s
D) 1.40 x 10-2 s
E) cannot be determined from this data
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