Example 2.4b: Calculation of Average Atomic Mass
A sample of magnesium is found to contain 78.70% of \(\ce{^24Mg}\) atoms (mass 23.98 amu), 10.13% of \(\ce{^25Mg}\) atoms (mass 24.99 amu), and 11.17% of \(\ce{^26Mg}\) atoms (mass 25.98 amu). Calculate the average mass of a Mg atom.
Think about it...