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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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