Question

Bromine has two naturally occurring isotopes. Bromine-79 with a mass of 79.904 amu and an abundance of 50.69% and Bromine-81 with a mass of 80.9163 amu and an abundance of 49.31%. What is the relative atomic mass of Bromine (using this made up data)?

Answer 1

To calculate the relative atomic mass of bromine using the given data, we can use the formula:

Relative atomic mass = (Isotope 1 mass × Isotope 1 abundance) + (Isotope 2 mass × Isotope 2 abundance)

Let's plug in the values:

Relative atomic mass = (79.904 amu × 50.69%) + (80.9163 amu × 49.31%)

Relative atomic mass = (40.5162536) + (39.839405153)

Relative atomic mass ≈ 80.3557 amu

Therefore, the relative atomic mass of bromine, using the given data, is approximately 80.3557 atomic mass units (amu).