) ( ) ( ( ) ( ) ( ) ( ) 3.96 FIND CARBON FROM CO AND CO2 0.467g CO 1 mol CO 1 mol C = 0.0166785 mol C [from CO] 28.g 1 mol CO 0.733g CO2 1 mol CO2 1 mol C = 0.016659 mol C [from CO2] 44. g 1 mol CO2 ADD C FROM BOTH COMPOUNDS TO GET TOTAL C (0.03333750 MOL C) Convert the carbon into grams 0.03333750 MOL x 12.0 g/mol = 0.40005g C ) ( ) ( ( ) ( ) FIND H FROM WATER, 0.450g H2O 1 mol H2O 2 mol H = 0.050 mol H = 0.050g H 18 g H2O 1 mol H2O ( ) ( ) HEY BUBBIES!, you could have found H by subtracting the C (.40005g) from the sample (0.450g) to get H as .050 grams! E-Z

NOW FIND YOUR EMPIRICAL FORMULA FROM THE MOLES! C 0.03333750 mol C/ = 0.03333750 = 1 C H 0.050 mol H/ 0. = 0.0333750 = 1.5 H C2H3 is your emp formula! ( ) ( ) 0.467g CO 1 mol CO 1 mol O = 0.0166785 mol O [from CO] 28.g 1 mol CO 0.733g CO2 1 mol CO2 2 mol O = 0.033318 mol O [from CO2] 44. g 1 mol CO2 THAT’S .O49996 MOL O X 15.99 G/MOL = 0.7994g rounded to 0.800g ( ) ( )