A particular reaction has an activation energy of 51.6 kJ/mol-rxn. How much faster is the reaction at 50 oC versus 25 oC?

Question

a. 2 times b. 5 times c. 3 times d. half as fast d. 20% as fast

I think it would be A??

Answer 1

The rule of thumb is 2x faster for each 10 C increase. But with the activation energy you can use the Arrhenius equation and calculate it.

Answer 2

So based of the rule of thumb, its going to be 5 times faster. Also how can I use Arrhenius equation without the rate constant (k)?