Percent Compo-Wha!?!?

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

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7w1PG4Ri_uywu0621Vb_uf43WfPWMrgmRpZvATO1YZICcYmy6u8mWx2ZVHQrajvlWZXV9b9DOa62q9bE_Ad9FfhAVXS1WUPttTJjsAt7LpjtPyrPmOFuY4PffZR9dXVbFP3YPsvmw_w8/s1600/Percent+Composition+Formula.bmp