Question

2. Magnesium has three naturally occuring isotopes. 78.70% of Magnesium atoms exist as

Magnesium-24 (23.9850 g/mol), 10.03% exist as Magnesium-25 (24.9858 g/mol) and 11.17%
exist as Magnesium-26 (25.9826 g/mol). What is the average atomic mass of Magnesium?

Answer 1

The average atomic mass of Magnesium is 24.270 g/mol.

Step-by-step explanation:

To find the average atomic mass of Magnesium, we need to calculate the weighted average based on the abundance and mass of each isotope. We will multiply the abundance of each isotope by its mass and sum the results.

1. The mass of Magnesium-24 is 23.9850 g/mol and its abundance is 78.70%. Multiplying these together gives us 18.867 g/mol.
2. The mass of Magnesium-25 is 24.9858 g/mol and its abundance is 10.03%. Multiplying these gives us 2.503 g/mol.
3. The mass of Magnesium-26 is 25.9826 g/mol and its abundance is 11.17%. Multiplying these gives us 2.900 g/mol.
4. Finally, we add up the results: 18.867 g/mol + 2.503 g/mol + 2.900 g/mol = 24.270 g/mol.

Therefore, the average atomic mass of Magnesium is 24.270 g/mol.

Learn more about Average atomic mass of Magnesium