The reaction: NO (g) + O3 (g) —> NO2 (g) + O2 (g) Is thought to be a second-order reaction with respect to O3. You start with [O3] = 0.250 M. After 125 s you find that the [O3] has dropped to 0.145 M. A) Assuming the reaction is second order, determine the value and units of the rate constant.  B) Determine the half-life of the reaction.  C) Calculate [O3] after 195 seconds.

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