UT
CHEM 1230 -
AN EMPIRICAL FORMULA BY ELEMENTAL ANALYSIS
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AN EMPIRICAL FORMULA BY ELEMENTAL ANALYSIS Ex 15g of a CxHyOz compound produce 33g of CO2 and 18g of H2O when combusted Determine its empirical formula CxHyOz O2 xCO2 yH2O MASS OF CARBON 33g CO2 x 1mol C 44 0g CO2 x 12 0g C 1 mol C 9g C MASS OF HYDROGEN 18g H2O x 2 mol H 18g H2O x 1 0g H 1 mol H 2g H MASS OF OXYGEN 15g 9g 2g 4g MOLES OF CARBON 9g C x 12 0g C 1 mol C 0 75 mol C MOLES OF HYDROGEN 2g H x 1 mol H 1 0g H 2 mol H MOLES OF OXYGEN 4g O x 1 mol O 16 0g O 0 25 mol O C 0 75 H 2 O 0 25 divide by smallest factor ANSWER C3H8O
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