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?

  1. First, determine the total activity.

    Calculate the total activity within the mixture.

  2. Next, determine the mole fraction.

    Calculate the mole fraction of the substance within the overall mixture.

  3. Finally, calculate the activity coefficient.

    Using the formula above, calculate the activity coefficient.

activity coefficient calculator
activity coefficient formula