Finding activation enthalpy from rate of reaction?

Question

Could someone explain how I find the activation enthalpy from the rate of reaction? In the experiment I have been changing the temperature of a solution of iodine and hydrogen peroxide, whilst keeping all concentrations the same, and timing the colour change from clear to dark blue. My text book was talking about the order of reaction for the concentrations you are changing, but I'm not changing any concentrations, so....

I don't know where to go from finding the rate of reaction for each temperature. And help/websites would be appreciated. thanks

Answer 1

You are right in thinking that the order of reaction has nothing to do with it, since you have kept all your concentrations the same.

You want something called the "Arrhenius Equation", which gives the relationship between rate and activation enthalpy.  Look it up online or in your course materials.