Answer:
The rate of reaction is - 2.868 * 10^-4 M/S
Explanation:
In the following reaction: 2 NO + O2 → 2NO2
NO will be consumed, when adding O2.
This means it will disappear. This is confirmed by the concentration at 5 seconds and 650 seconds.
A = -Δ[A] / ΔT = [A2] - [A1] / T2 - T1
(0.225 - 0.04) / (650 - 5) = 0.185 / 645 = 2.868 * 10^-4 M/S
Since it will disappear, this number will be negative : - 2.868 * 10^-4 M/S
The rate of reaction is - 2.868 * 10^-4 M/S