determination of a chemical formula

determination of a chemical formula - Date Performed:...

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Date Performed: 9/19/2011 Ann Forrest Date Submitted: 9/25/2011 Partner: Eunbeul An Instructor: Emily Klein Determination of a chemical formula Objective To determine the percentage composition and simplest formula for an oxide of copper by its reduction with methane gas (CH 4 ) at approximately 500°C. This is a study of stoichiometry. Experimental Data Mass of empty test tube: 17.47 g Mass of test tube+ Copper Oxide: 19.42 g Mass of Copper Oxide: 1.95 g Mass of test tube +Copper: 19.03 g Mass of Copper: 1.56 g Mass of Oxygen: 0.39 g Sample Calculations 1. Mass of Copper: mass of test tube and copper- mass of empty test tube 19.03g-17.47g= 1.56g Cu 2. Mass of Oxygen: Mass of Copper Oxide- Mass of Copper 1.95g- 1.56g= 0.39g O 3. Mass percent: mass of element(g)/ total mass of sample(g) x100 Mass percent of Copper: mass Cu/mass of Copper Oxide x 100 1.56g/1.95g x 100= 80.0% Cu Mass percent of Oxygen: mass O/mass of Copper Oxide x 100 0.39g/1.95g x 100= 20.0% O
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determination of a chemical formula - Date Performed:...

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