1) The vanillin molecule is the primary molecule present in vanilla extract. The molecular mass of vanillin is 152.08 grams per mole and contains 63.18% carbon, 5.26% hydrogen, and 31.56% oxygen. What is the molecular formula of vanillin?
2) A sample of fuel is found to contain 87.4% nitrogen and 12.6% hydrogen. If the molecular mass of the fuel is 32.05 grams/mole, what is the molecular formula of the fuel?
3) A compound is analyzed and found to have a mass of 289.9 grams/mole and contain 49.67% carbon, 48.92% chlorine and 1.39% hydrogen. What is the molecular formula of the compound?
4) A compound is analyzed and found to contain 35.66% carbon, 16.24% hydrogen and 45.10% nitrogen. What is the empirical formula of the compound?