Today in chemistry class, Mr. Doktor taught us about percent composition by mass. We learned how to figure out the percent by mass of each element in a compound.
* To relate the mass of each element in a compound to the entire mass of the compound we use percent composition.
Example. H20--------- (2) molar mass of hydrogen in the compound / (18) total molar
mass of the compound = 0.111 = 11.11% of hydrogen
(16) molar mass of oxygen in the compound / (18) total molar mass of the compound
= 0.889 = 88.89% of oxygen
* To check your answer, add up all the percents and if the sum is 100 you did it right.
* 11.11%
+
* 88.89%
= 100%
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