KLINICS-Subject Guide
Find the Average Atomic Mass - Example: Magnesium PDF Print E-mail
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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

 

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Atomic Symbols PDF Print E-mail
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Written by Pearlita   
Saturday, 31 March 2012 08:19
อธิบายวิธีการได้รับจำนวนโปรตอนนิวตรอนและอิเล็กตรอนของอะตอมจากสัญลักษณ์อะตอม
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Calculating Moles from Grams (Mass to Moles) PDF Print E-mail
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Written by Pearlita   
Tuesday, 27 March 2012 10:34

 

 

 

 

อธิบายวิธีการคำนวณโมเลกุลจากกรัม

 

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http://lessons.chemistnate.com/moles-and-mass.html

 
How to Calculate Grams from Moles (Moles to Mass) PDF Print E-mail
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Written by Pearlita   
Tuesday, 27 March 2012 10:48

 

 

 

How do you calculate the mass of a substance, given the number of moles?

 

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http://lessons.chemistnate.com/moles-and-mass.html

 
How to Calculate Molar Mass PDF Print E-mail
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Written by Pearlita   
Tuesday, 27 March 2012 10:25

 

 

 

อธิบายวิธีการคำนวณมวลโมเลกุลของธาตุและโมเลกุล

 

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