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a similar expression for the rate constant of a reaction, given as follows:

:

Integration of this expression leads to the Arrhenius equation

:

where k is the rate constant. A was referred to as the frequency factor (now called the pre-exponential coefficient), and E_a is regarded as the activation energy. By the early 20th century, many had accepted the Arrhenius equation, but the physical interpretation of A and E_a remained vague. This led many

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