Problem: 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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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

E) cannot be determined from this data

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