How to calculate average atomic mass from isotopes?

You can use the average atomic mass per isotope to calculate the average atomic mass of an unknown sample. This works because the relative abundance of an element in a sample is directly proportional to the number of atoms of that element. In other words, if one element has 1 trillion atoms of it in a sample, and another element has 5 trillion, then there are 20 times as many atoms of the first element in the sample.

How to calculate average atomic mass from isotope mass?

The relationship between the chemical element mass and the atomic mass is called the isoelement The isoelement is a specific mass of pure atoms of the chemical element. The atomic mass of an element is the relative mass of an atom of that element. That is, the mass of a pure sample of the element is equal to the sum of the atomic masses of the atoms that make it up.

How to calculate average atomic mass from isotope abundances?

The relative abundance of an isotope is simply the ratio of the number of atoms of that isotope to the total number of atoms in the sample. Thus, the number of atoms of a given element per mass of sample is the sum of the number of atoms of each isotope of that element. The sum of all isotopic abundances of the element is called the “abundance” of that element.

How to calculate average atomic mass from isotope mass ratio?

The mass ratio of an isotope is the ratio of the mass of one isotope to the total mass of all isotopes of that element. The mass ratio is expressed in atomic mass units (amu) as a percentage. Using the relative atomic mass of the lightest isotope and the sum of the relative atomic mass of all other isotopes gives you the average atomic mass.

How to calculate average atomic mass from isotopes ratio?

If you know the ratio between the number of atoms of two different isotopes of an element, you can calculate the average atomic mass of this element. You can use the following equation: