How to Find the Percent Composition by Mass for Al2SO43 Aluminum sulfate

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http://youtube.com/watch?v=pxkPh1JMMAg

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: • How to Calculate Molar Mass (Molecula... • How to Find Percent Composition: • How to Find the Percent Composition b... • Mole/Stoichiometry Playlist: • Moles, Grams, and More (Stoichiometry) • 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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