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In this video, we're going to go over how to calculate percent composition by mass.
00:06
Specifically, we're going to use nh3 as our example.
00:11
To start, we need to find the molar mass of each element in the compound.
00:16
In nh3, we have nitrogen, which has a molar mass of 14 .0067, and hydrogen, which has a molar mass of 1 .00784.
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Then, we need to find the molar mass of the compound itself.
00:29
To do this, we take the molar mass of one nitrogen, because there is one nitrogen atom in each nh3, which is 14 .0067, and add it to three hydrogen atoms because nh3 has three hydrogen atoms in it.
00:47
So we add 14 .0067 to three times 1 .00784 to get 17 .03022...
