text: Considering as example the decomposition of nitrogen dioxide into nitrogen monoxide and molecular oxygen: 
  Based on the red "line of best fit" plotted in the graph given above:
  Points read from graph:
  Slope of red line = (4.1 − 2.2) / (0.0015 − 0.00165) = −12,667
  Intercept [y-value at x = 0] of red line = 4.1 + (0.0015 × 12667) = 23.1
  Inserting these values into the form above:
  yields:
  as shown in the plot at the right.
  for:
  * k in 10 cm mol s
  * T in K
  Substituting for the quotient in the exponent of :
  where the approximate value for R is 8.31446 J K  mol
  The activation energy of this reaction from these data is then: