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Measurement 5 - Determination of a Chemical Formula Date...

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Determination of a Chemical Formula Date Performed: 9/25/08 Name: Neal Moriconi Date Submitted: 10/9/08 Partner: Stephen Hunter Instructor: Diaqiang Xu Determination of a Chemical Formula Objective: The purpose of this experiment is 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. Experimental Data: Mass of test tube 17.370g +/- .001g Mass of test tube and Cu Oxide 19.147g +/- .001g Mass of test tube and Cu 18.194g +/- .001g Sample Calculation: moles = mass, g/ molar mass, g/mol Mole of oxygen atoms = 45.0g/16.0g/mol = 2.81 moles Mole of potassium atoms = 55.0g/39.1g/mol = 1.41moles Atom ratio = Mole of oxygen atoms/ Mole of potassium atoms = 2.81/1.41 = 1.99 Results and Conclusions: Mass of Cu Oxide 19.147g - 17.370g = 1.777g Mass of Cu 18.194g - 17.370g = 0.824g Mass of O 1.777g - 0.824g = 0 .953g Uncertainty for mass of Cu & O √(.001² + .001²) = .0014g Mass Percentage of Cu in the oxide (.824g +/- .001g)/(1.777g +/- .001g)*100 = 46.37% Mass Percentage of O in the oxide (.953g)/(1.777g)*100 = 53.63% Uncertainty for Mass percentage of Cu in copper oxide (Sr/46.37)² = (.001/.824)² + (.001/1.777)² Sr = +/- 0.062g Uncertainty for Mass percentage of O in copper oxide (Sr/53.63)² = (.001/.953)² + (.001/1.777)² Sr = +/-0.0041g
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