Hi
Also, since k is a function of temperature, if [tex]k_{1}[/tex] and [tex]k_{2}[/tex] are rate constants measured at [tex]T_{1}[/tex] and [tex]T_{2}[/tex] we have from the Arrhenius Equation,
[tex]
\frac{k_{2}}{k_{1}} = e^{\frac{E_{a}}{R}(\frac{1}{T_{1}}\frac{1}{T_{2}})}
[/tex]
So actually this eliminates the need to know the frequency factor A. All you need to know is the rate constants measured at two different temperatures or even their ratio [tex]\frac{k_{2}}{k_{1}}[/tex] and that is enough to get [tex]E_{a}[/tex], which turns out to be,
[tex]
E_{a} = R\frac{T_{1}T_{2}}{T_{2}T_{1}}log_{e}\frac{k_{2}}{k_{1}}[/tex]
Please make note of this correction in my previous post.
