Percentage Composition. Recall that the FORMULA WEIGHT [or molar mass] of a substance is the MASS IN GRAMS of ONE MOLE of particles of that substance. One mole contains 6.022 X 10 23 particles. This number is called AVOGADRO’S NUMBER .
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Recall that the FORMULA WEIGHT [or molar mass] of a substance is the MASS IN GRAMS of ONE MOLE of particles of that substance.
Within the mass of a mole of any compound, EACH ELEMENT contributes a CERTAIN PERCENTAGE to the OVERALL MASS.
Now we will use the data from EACH ELEMENT to find the Percentage Composition:
Finally, CHECK YOUR MATH! Add all the PERCENTAGES together….they should be VERY CLOSE TO 100%!
1 26.982 26.982
1 30.974 30.974
4 15.999 63.996
22.13 25.40 52.48 100.01