An unknown compound is composed of carbon, hydrogen and oxygen. A 4.30 g sample is ignited and creates 8.59 g CO₂ and 3.52 g H₂O. If the molar mass is 176.22 g/mol, what is the molecular formula?

In the presence of a small amount of oxygen a combustion reaction will not only produce carbon dioxide, but also carbon monoxide. The incomplete combustion of naphthalene, a hydrocarbon used in many dyes, produced 2.80 g CO, 4.40 g CO₂ and 1.44 g H₂O. Determine its empirical formula.

Combustion analysis is performed on 0.50 g of a hydrocar-bon and 1.55 g of CO₂, and 0.697 g of H₂O are produced. The mass spectrum for the hydrocarbon is provided below. What is the molecular formula? (LO 3.12 and 3.13)

(a) C₅H₁₁ (b) C₈H₁₈ (c) C₁₁H₁₀ (d) C₁₀H₂₂

(b) What products form in this reaction?

(b) Menthol, the substance we can smell in mentholated cough drops, is composed of C, H, and O. A 0.1005-g sample of menthol is combusted, producing 0.2829 g of CO₂ and 0.1159 g of H₂O. What is the empirical formula for menthol? If menthol has a molar mass of 156 g/mol, what is its molecular formula?

(a) Combustion analysis of toluene, a common organic solvent, gives 5.86 mg of CO₂ and 1.37 mg of H₂O. If the compound contains only carbon and hydrogen, what is its empirical formula?