15.61 (6th edition)

Arrhenius Equation:

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15.61 (6th edition)

Postby Schuyler_Howell_4D » Wed Mar 13, 2019 11:18 pm

Can someone explain where they got the equation they use to solve for Ea:


Andrea Zheng 1H
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Re: 15.61 (6th edition)

Postby Andrea Zheng 1H » Thu Mar 14, 2019 12:28 am

They got this by using the equation ln(k) = -Ea/(R*T). Because you are finding the difference in two different k values, you would use ln(k')-ln(k), which is ln(k'/k). On the other side of the equation, you would have Ea (which is constant) and R (which is constant) and T (which changes). This means you would end up with Ea/R multiplied by the difference in temperatures, which has 1/Temperature because temperature is in the denominator in ln(k) = -Ea/(R*T). Therefore, you get ln(k'/k) = (Ea/R)[(1/T)-(1/T')].

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