標題: Atom, Molecules and stoichiometry [打印本頁] 作者: kankanqa 時間: 10-10-3 02:37 AM
標題: Atom, Molecules and stoichiometry
In an experiment, 10 cm3 of a gaseous hydrocarbon were mixed with 225 cm3 of excess air, and the mixture ignited. On cooling to room temperature and pressure, 210cm3 of gases remained, and on shaking with caustic soda(NaOH) solution, the gaseous volume was reduced by 30cm3. Calculated the molecule formula of the hydrocarbon.作者: abcdefg111 時間: 10-10-3 10:24 AM
In an experiment, 10 cm3 of a gaseous hydrocarbon were mixed with 225 cm3 of excess air, and the mixture ignited. On cooling to room temperature and pressure, 210cm3 of gases remained, and on shaking with caustic soda(NaOH) solution, the gaseous volume was reduced by 30cm3. Calculated the molecule formula of the hydrocarbon.
let the molecular of hydrocarbo be CxHy
CxHy +( x+y/4)O2 --> xCO2 +y/2 H2O
10cm3 45cm3 30cm3
so x=3 x+y/4 =4.5 y=1.5*=6
molecular of hydrocarbon is C3H6作者: kankanqa 時間: 10-10-3 04:43 PM
In an experiment, 10 cm3 of a gaseous hydrocarbon were mixed with 225 cm3 of excess air, and the mixture ignited. On cooling to room temperature and pressure, 210cm3 of gases remained, and on shaking with caustic soda(NaOH) solution, the gaseous volume was reduced by 30cm3. Calculated the molecule formula of the hydrocarbon.
O2 remained = 210-30 =180
O2 used =225-180=45