Percent composition in it basic form is Part/Whole. Its taking the ratio in a compound, using how much of a compound you have: converting it to g/mol and finally knowing the % of something in a compound.
Here is an example: you have 2.5 grams of H2O2 (Hydrogen Peroxide) find the % of Hydrogen then the weight in g
You need to multiply H2 and O2 by there weight on the periodic table: H2*1=2amu + O2*16=38amu
all together that makes 40amu
2amu/40amu = 0.05 amu * 100 = 5% Easy right? we have the first part of our answer.
2.5g * 0.05 = 0.125g
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