To find the percent composition (by mass) for each element in Al2(SO4)3 we need to determine the molar mass for each element and for the entire Al2(SO4)3 compound.
We’ll use the following formula for percent composition by mass:
Percent Composition by Mass = (Molar Mass of Element x Number of that Element)/ Molar Mass of Compound
In this video I’m using a Periodic Table that rounds to two decimal places. You may be asked to use a Periodic Table with more decimal places, however the process to find the percent composition by mass is the same.
----- Useful Resources------
Molar Mass in Three Easy Steps: youtu.be/o3MMBO8WxjY
How to Find Percent Composition: youtu.be/Snnt0CpkWSM
Mole/Stoichiometry Playlist: youtube.com/playlist?list=PLZR1BGWBaZ1zrlxkYJDNW_HWdUib0Q8Pa
Note that if you add up the percentages for all of the elements it should be close to 100%. Often it will not be exact to the rounding of the atomic mass for elements.
Note: Al2(SO4)3 is also known as Aluminum sulfate.
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