To calculate the relative atomic mass of magnesium, we need to consider the isotopic masses and their respective abundances.
The isotopic masses of magnesium are as follows: Mg-24: 24.305 amu Mg-25: 25.305 amu Mg-26: 26.305 amu
Given the abundances: Mg-24: 78.99% Mg-25: 10.00% Mg-26: 11.01%
To calculate the relative atomic mass, we multiply each isotopic mass by its abundance and sum them up:
(24.305 amu * 0.7899) + (25.305 amu * 0.1000) + (26.305 amu * 0.1101)
= 19.167395 amu + 2.5305 amu + 2.8921805 amu
= 24.59 amu
Therefore, the relative atomic mass of magnesium is approximately 24.59 amu.