# Problem: The rate constant of a reaction is 4.50×10−5 L/mol•s at 195°C and 3.20 x 10-3 L/mol•s at 258°C. What is the activationenergy of the reaction?

###### FREE Expert Solution

We’re being asked to determine the activation energy (Ea) of a reaction. We’re given the rate constants at two different temperatures.

This means we need to use the two-point form of the Arrhenius Equation:

where

k1 = rate constant at T1

k2 = rate constant at T2

Ea = activation energy (in J/mol)

R = gas constant (8.314 J/mol•K)

T1 and T2 = temperature (in K)

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###### Problem Details

The rate constant of a reaction is 4.50×10−5 L/mol•s at 195°C and 3.20 x 10-3 L/mol•s at 258°C. What is the activation
energy of the reaction?