Where do we find the values for A?

Arrhenius Equation: $\ln k = - \frac{E_{a}}{RT} + \ln A$

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RRahimtoola1I
Posts: 102
Joined: Fri Aug 09, 2019 12:15 am

Where do we find the values for A?

Are the values for A given to us somewhere or is there a way to calculate them?

DLee_1L
Posts: 103
Joined: Sat Aug 17, 2019 12:17 am

Re: Where do we find the values for A?

A is usually a constant that refers to the frequency of correct orientation collisions there are. However, if you have the equilibrium constant, activation energy, and temperature, you will be able to calculate the A via the Arrhenius equation.

Viviana Velasquez
Posts: 97
Joined: Sat Jul 20, 2019 12:15 am

Re: Where do we find the values for A?

If you are solving for something besides A, it will be given to you since the constant differs with each equation.

Andres Merlos 2L
Posts: 46
Joined: Wed Sep 18, 2019 12:17 am

Re: Where do we find the values for A?

It's pretty much like finding a missing variable for any standard equation. As long as you have the temperature, activation energy, gas constant, and gas constant, you can solve for A. A is the frequency of collisions.

Hannah Pham
Posts: 104
Joined: Fri Aug 09, 2019 12:17 am

Re: Where do we find the values for A?

A is the frequency of collisions. You can calculate A using the Arrhenius equation given the other variables, including temperature, activation energy, and equilibrium constant.

rohun2H
Posts: 100
Joined: Wed Sep 18, 2019 12:19 am

Re: Where do we find the values for A?

Arrhenius equation can be used to determine A if not given.

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