To find the percent composition (by mass) for each element in Zn(OH)2 we need to determine the molar mass for each element and for the entire Zn(OH)2 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: https://youtu.be/o3MMBO8WxjY
How to Find Percent Composition: https://youtu.be/Snnt0CpkWSM
Mole/Stoichiometry Playlist: https://www.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: Zn(OH)2 is also known as Zinc hydroxide.



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