Find the Average Atomic Mass - Example: Magnesium |
|
|
|
Written by Pearlita
|
Saturday, 31 March 2012 08:43 |
How to find the average atomic mass of an element. You need to know the mass of each isotope and the percent (%) abundance of each as well. Multiply each mass by its corresponding percentage, and add these products together.
Answer:
Each percentage here is called the isotopic abundance of that particular isotope.
The average atomic mass (mass on the periodic table) is a weighted average of all isotopes.
Average Atomic Mass = (% of isotope 1)(mass of isotope 1) + (% of isotope 2)(mass of isotope 2) + ...
In this case, the average atomic mass of magnesium is
(0.7870)(23.985 amu) + (0.1013)(24.985 amu) + (0.1117)(25.983 amu) = 24.309 amu
ที่มา
http://www.youtube.com/
http://lessons.chemistnate.com/
|
|
|
|
|
Page 14 of 30 |