## What is 'A'?

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

AlyssaYeh_1B
Posts: 100
Joined: Sat Aug 17, 2019 12:16 am

### What is 'A'?

In my notes, 'A' is defined as the frequency factor or pre-exponential factor (including # of collisions with correct orientation). What does this mean? Is this what we're trying to calculate with the Arrhenius equation?

Fiona Latifi 1A
Posts: 102
Joined: Sat Sep 14, 2019 12:16 am

### Re: What is 'A'?

With the Arrhenius equation, we are trying to calculate K, the equilibrium constant.

Luyan Zhang - 2D
Posts: 103
Joined: Sat Jul 20, 2019 12:16 am

### Re: What is 'A'?

A is a constant: it is the fraction of molecules that make collisions which are significant to the chemical equation.

Matt F
Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

### Re: What is 'A'?

So A will always be given for a reaction?

MinuChoi
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

### Re: What is 'A'?

A is a unique constant for a chemical reaction, similar to the k constant of a reaction.

vibha gurunathan 1h
Posts: 51
Joined: Mon Oct 07, 2019 12:15 am

### Re: What is 'A'?

AlyssaYeh_1B wrote:In my notes, 'A' is defined as the frequency factor or pre-exponential factor (including # of collisions with correct orientation). What does this mean? Is this what we're trying to calculate with the Arrhenius equation?

I'm pretty sure it's given. From what I remember in class, Dr. Lavelle said it was angular dependence but we don't have to calculate it.