## Chemistry and Chemical Reactivity (9th Edition)

a) $C_5H_4$ b) $C_{10}H_8$
a) Number of moles of $CO_2$: $1.0620\ g\div 44.001\ g/mol=0.0241\ mol$ $0.0241\ mol$ of C Number of moles of $H_2O$: $0.1739\ g\div 18.015\ g/mol=0.00965?\ mol$ $0.0193\ mol$ of H H/C Ratio: $0.80=4/5$ Empirical formula: $C_5H_4$ b) Molar mass of the empirical formula: $64.085\ g/mol$ $128.2/64.085=2.00$ Molecular formula: $C_{10}H_8$