First three are Khan Academy(why yes I am a nerd) and I have found this site is extremely helpful
Empirical formula from mass composition
Empirical, molecular, and structural formulas
Molecular weight percentages
This next one I found online...obviously, but it's kind've a rundown of chem in general with a lot of chemical composition that is helpful
CLICK HITHER
Another Good review
CLICK HITHER AGAIN
Same website more review
GUESS WHAT...CLICK HERE
Good luck.
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