Enter the average atomic mass of the substance and the mass of the isotope into the calculator 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

## 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?

1. First, determine the average atomic mass.

Determine the average atomic mass of the substance.

2. Next, determine the mass of the isotope.

Calculate the mass of the isotope.

3. Finally, calculate the percent abundance.

Calculate the percent abundance using the formula above.