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Rate of a reaction triples when the temperature is increased from 25C to 35C. Calculate the activation Energy?

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sadsdas:
Rate of a particular reaction triples when the temperature is increased from 25C to 35C. Calculate the activation energy for this reaction?
How to approach the problem when there is no rate constant? What formula to use?

Yolanda:
anytime you read "activation energy" and "temperature" in the same sentence you should immediately think "Arrhenius equation"
.. k = A x exp(-Ea / RT)

and since you have "rate" not "k" we can do this
.. rate = k x [A]^n.... .  

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