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  • How to calculate percentage composition by mass
  • What's that? 
  • The formula: %composition= grams of element/ grams of compound * 100               
  • What is It:  the percent by mass of each element in a compound. 
  • 1) find the molar mass of H20: 18.02 2) find the greater compostion of each element:  H=2.202/18.02*100=11.21 O= 16.00/18.02*100= 88.79 Answers: %H= 11.21                      %O=88.79
  • Example: 
  • Find the percent composition of water.
  • Oh wow! That's simple!
  • Yay! You've learned how to calculate percentage composition by mass! 
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