Enter the activity of a substance and the mole fraction of the substance in the mixture to determine the activity coefficient.

## Activity Coefficient Formula

The following formula is used to calculate an activity coefficient.

y = a/x

- Where y is the activity coefficient
- a is the total activity
- x is the mole fraction of the substance

## Activity Coefficient Definition

An activity coefficient is defined as the ratio of total activity to the mole fraction of a substance in a mixture of 2 or more chemical substances.

## Activity Coefficient Example

How to calculate an activity coefficient?

**First, determine the total activity.**Calculate the total activity within the mixture.

**Next, determine the mole fraction.**Calculate the mole fraction of the substance within the overall mixture.

**Finally, calculate the activity coefficient.**Using the formula above, calculate the activity coefficient.

## FAQ

**What is an activity coefficient?**

An activity coefficient is a term used to measure the deviations in chemical mixtures from the ideal mixture.

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