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Report 5 - Determination of a Chemical Formula

# Report 5 - Determination of a Chemical Formula - Date...

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Date Performed: 9/30/10 Name: Allan Gibson Date Submitted: 10/7/10 Partner: Patrick Mason Determination of a Chemical Formula Objective : The objective of this lab was to find the percent composition and empirical formula of a copper oxide. We used methane gas at around 500°C to reduce the copper oxide. Experimental data : Mass of test tube: 17.428g ± 0.01g Mass of test tube plus contents: 19.428g ± 0.01g Mass of mixture: 2.000g ± 0.01g Final mass of test tube plus copper: 19.052g ± 0.01g Mass of copper 1.624g ± 0.01g Sample Calculations : Mass of Copper Oxide Mass of test tube with copper oxide with copper oxide-mass of test tube 19.428g ± 0.01g – 17.428g ± 0.01g = 2.000g ± 0.01g Mass of Copper Mass of test tube with copper – mass of test tube 19.052g ± 0.01g – 17.428g ± 0.01g = 1.624g ± 0.01g Mass Percentage of Copper (1.624g/2.000g) * 100 = 81.2%

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Mass of Oxygen Mass of copper oxide – mass of copper 2.000g ± 0.01g – 1.624g ± 0.01g = .376g ± 0.01g Mass Percentage of Oxygen (0.376g/2.000g) * 100 = 18.8%
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Report 5 - Determination of a Chemical Formula - Date...

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