rate constant
posted by charlie .
A reaction has a rate constant of 1.25×10−4 at 28 and 0.227 at 77. Determine activation barrier for reaction
What is the value of the rate constant at 18?

Use the Arrhenius equation and solve for Ea.
Use the Arrhenius equation a second time with the Ea determined in the first part along with either k1 or k2 and calculate k3 for 18 C.