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So how do you calculate Percent composition?
First, you add up the masses of the elements in the compound.
Then, when you get the sum you find what portion of the compound a specific element makes up. Divide the mass of the element by the molar mass of the compound.
Finally, you multiply that number by a 100. The resulting number is your percent.
Let me use water as an example.
The total molar mass of water is 18.016. So you get the masses of hydrogen(1.008) and oxygen(16) and divide them by the molar mass.
Then you multiply these numbers by a 100. The resulting numbers would be 11.19 for hydrogen and 88.81 for oxygen!
Wow! That is much simpler then I thought it would be!
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