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Here is the question I need to solve:

The rate constant is given by $\log k = 5.4 - (212/T)$
Calculate the activation energy at $127\ ^\circ\mathrm{C}$.

I know the formula

$$k = A\times e^{-{E_\mathrm{a}/RT}}$$

But, I need to know A (Arrhenius constant) to calculate the required. This value has not been provided in the question. So, what is the method to solve this sort of question?

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In the question, observe that the statement is of the form

logK=logA - Ea/RT

which is derived from the Arhennius Equation by taking logarithm on both sides of the equation. Hence, logA=5.4 and 212/T = Ea/2.303*R*T

I'll leave the calculations to you.

Cheers.

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    $\begingroup$ On that thought just drop an up vote on my answer. 😉 $\endgroup$ – user36160 Oct 16 '16 at 14:08

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