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

## 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

## 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.

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