Determine Activation Energy from rate?

[jtruth914]

On my test the professor gave us the rate, parameters of A, and temperature of 298K. We were asked to find the activation energy. I know that the Arrhenius equation is LnK= LnA-Ea/RT. However, he did not give us the rate constant "K" instead he gave us the rate. How do you determine activation energy using the rate.

 

[Ygggdrasil]

Did he tell you the reaction, the concentration of reactants, and the rate law?

 

[jtruth914]

No he didn't. I assumed it was a zeroth order reaction where k=rate. Even though he didn't specify that. That's what confused me.