Can I Use Rates Instead of Rate Constants in an Arrhenius Plot?

[mycotheology]

Heres the question:
http://img215.imageshack.us/img215/1185/screenshot5xq.png
Kinetics is probably my weakest area in chemistry so I'm struggling. To find the shelf life, I need to use the Arrhenius equation but I don't know the activation energy Ea or the A constant. So I converted 2 those percentages into rates and got:
At 40C, rate = 0.082 %/month
At 60C, rate = 0.39 %/month
I know that if I plot 1/T vs. lnk, I get an Arrhenius plot and then I can find Ea from the slope and A from the y-intercept but I don't have k. Can I just use the rates that I have instead of k?

 

[Borek]

You have two data points and two unknowns, that means you should be able to find both solving system of two equations.

 

[mycotheology]

Can you elaborate on that a bit. Do you mean use simultaenous equations?

 

[Borek]

Yes.

 

[LudusRex]

Yes, you can use the rates instead of the specific rate constant k in the Arrhenius equation. The rate of a reaction is equal to the rate constant multiplied by the concentrations of the reactants, so you can use the rates you have calculated in place of k. Just be sure to use the same units for the rates and temperature in the Arrhenius plot.