1. The problem statement, all variables and given/known data In a reaction between ozone and an organic species, the observed rate was found to depend only on the concentration of ozone at 298 K. Using the data below, determine the order of this reaction and the rate constant (include units). Time (s) |Ozone conc (molecules/cm3) 0 | 4.311×1015 50 | 2.890×1015 100 | 2.036×1015 150 | 1.435×1015 200 | 0.995×1015 250 | 0.689×1015 2. Relevant equations 3. The attempt at a solution Is it first order? I plotted the graph of ln[O3] vs. time on excel and that was a straight line. Also to find k, do I use ln[A]t = ln[A]o - kt? If I use this equation, which value do I use for [A]t?--because the value of k differs slightly for different values.