Different Ways to Measure Reaction Rates
Reaction rate varies with time as the reaction proceeds!
C2H4(g) + O3(g) C2H4O(g) + O2(g)
average rate = - D[O3] /Dt = - (1.10 x 10-5 mol/L) - (3.20 x 10-5 mol/L)
60.0 s - 0.0 s
Similar calculations over earlier and later time intervals (e.g., 0.0 -10.0 s,
50.0 - 60.0 s) reveals average rates of 7.80 x 10-7 mol/L/s and
1.30 x 10-7 mol/L/s, respectively.
= 3.50 x 10-7 mol/L/s
Data show that the average rate decreases as the
reaction proceeds!
| Previous slide | Next slide | Back to first slide | View graphic version |