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Using an Arrhenius plot

by mycotheology
Tags: arrhenius, plot
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mycotheology
#1
Mar25-12, 12:13 PM
P: 90
Heres the question:

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?
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Borek
#2
Mar25-12, 01:16 PM
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You have two data points and two unknowns, that means you should be able to find both solving system of two equations.
mycotheology
#3
Mar25-12, 02:06 PM
P: 90
Can you elaborate on that a bit. Do you mean use simultaenous equations?

Borek
#4
Mar25-12, 02:21 PM
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P: 23,372
Using an Arrhenius plot

Yes.


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