Compound Table

How do you figure out percent of chemical in a compound? Example: % of oxygen in KClO3 by mass/ periodic table
To find the percent of oxygen:
Oxygen’s molar weight is 16 g/mol
KClO3 is 122.4 g/mol
There are three atoms of oxygen in the compound so 16 x 3= 48
48/122.4 x 100% = 39.2 % oxygen in the compound.
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