A 58.0 g sample of unknown composition was carefully analyzed and found to consist of 24.3 g of carbon, 3.072 grams of hydrogen, 5.406 g of oxygen, and the remainder of nitrogen. determine the empirical formula of the unknown compound. a) C₃H₈NO b) C₂H₆N₂O c) C₄H₁₀N₂O₂ d) C₅H₁₂N₂O₄