Enter the average atomic mass of the substance and the mass of the isotope into the calculator to determine the percent abundance.

- Average Atomic Mass Calculator
- Mass Molarity Calculator
- Molarity Calculator
- Moisture Content Calculator

## Percent Abundance Formula

The following formula is used to calculate the percent abundance of an isotope.

A = IM/AM*100

- Where A is the percent abundance
- AM is the average atomic mass
- IM is the mass of the isotope

## Percent Abundance Definition

A percent abundance is the ratio of the amount of mass of an isotope to the total mass of a substance.

## Percent Abundance Example

**Example Problem 1: **

First, determine the average atomic mass. For more information on calculating the average atomic mass of a substance, visit the calculator linked above.

For this example, the average atomic mass is found to be: 400.

Next, determine the mass of the isotope.

For this example, the isotope mass is found to be 200.

Finally, calculate the percent abundance using the formula above:

A = IM/AM*100

A = 200/400*100

A = 50%

## FAQ

**What is a percent abundance?**

A percent abundance is a ratio of the amount of mass of a given isotope to the overall mass of the substance or element.

How to calculate a percent abundance?

**First, determine the average atomic mass.**Determine the average atomic mass of the substance.

**Next, determine the mass of the isotope.**Calculate the mass of the isotope.

**Finally, calculate the percent abundance.**Calculate the percent abundance using the formula above.