I am having trouble with determining where I erred in the following exercise. If someone could point out my mistake, I would appreciate the help.

Thank you!

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1. The decomposition of N_{2}O_{5} has an activation energy of 103 kJ/mol and a frequency factor of [tex] 4.3E13 s^-1 [/tex]. What is the rate constant for this decomposition at 20°C?

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I simply substituted the given values into the Arrhenius Equation (omitting units to save time in typing):

[tex] k = Ae^{\frac{-E_a}{RT}}[/tex]

[tex] k = 4.3E13 \times e^{\cfrac{-103}{8.314 \times 293 K}}[/tex]

Are you *sure* you're using the right units, since you omitted them in your original post? What units are you using for the gas constant? Activation energy? Temperature?

I would go back and check them again.

P.S. - I think these sorts of questions belong in the Homework Help section (even if it's not technically a homework question, it very strongly resembles one, at least IMO.)

I apologise; I didn't realise that this was the correct forum. If someone could please move this to the Homework Help section, that would be appreciated.