## Chemistry and Chemical Reactivity (9th Edition)

Number of moles of water: $4.14\ g\div 18.015\ g/mol=0.23\ mol$, $0.46\ mol\ H$ Number of moles of $CO_2$: $8.80\ g\div 44.01\ g/mol=0.20\ mol$, $0.20\ mol\ C$ Since both have 4 carbons, $0.05\ mol$ Number of hydrogens: $x\times 8+(0.05-x)\times 10=0.46$ $x=0.02\ mol$ butene, $1.12\ g$ Mass fraction: Butene: $1.12/2.86\times 100\%=39.2\%$ Butane: $100\%-39.2\%=60.8\%$