Of course you guys don't mind, you're good Samaritans. Naow den, I've been bombing chemistry miserably, and by miserably I mean a damn 17. And now, I need whatever help I can get to boost that, hence the reason I'm here once again for some answers, assuming not everyone here is a bunch of crazy foo's.

Anyway, I need help with molecular formulas. Ring a bell, anyone? Empirical formulas as well, but yeah, here's the question I need some help with, since it's been awhile since I've done the subject, and suck miserably at recalling things I'll never use again.

I pray to god you guys know molar mass formulas, or I'm gonna die in chemistry.

Use the % compositions to determine the empirical formula, then use the molar masses to determine the molecular formula.

55.8% Carbon, 7% Hydrogen, 37.2% Oxygen, Molar mass = 86 G/mol

64.9% Carbon, 12.5% Hydrogen, 21.7% Oxygen, Molar mass = 21.7 G/mol

72% Carbon, 12% Hydrogen, 16% Oxygen, Molar mass = 200 G/mol

51.4% Carbon, 8.6 Hydrogen, 40% oxygen, Molar mass = 140 G/mol

55.8% Carbon, 7% Hydrogen, 37.2% Oxygen, Molar mass = 86 G/mol

40.6% Carbon, 5.1 Hydrogen, 54.3% Oxygen, Molar mass = 118 G/mol

67.6% Carbon, 7.4% Hydrogen, 25.9% Nitrogen, Molar mass = 108 G/mol

41.7% Carbon, 2.8% Hydrogen, 22.2% Sulfur, 33.3% Oxygen, Molar Mass = 288 G/mol

74% Carbon, 8.6 Hydrogen, 17.3% Nitrogen, Molar mass = 162 G/mol

Save me. D:

~Vanhelsing~