Lab Experiment 3 9-20-07 revise - 9-20-07Ch...

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Unformatted text preview: 9-20-07Ch 200-42Experiment ThreeProving Daltons Law of ProportionsPurpose:The purpose is to determine the heat of combustion of magnesium metal and contrast the results with theoretical values.Data and Calculations:Equations:Final1.2Mg + O2 -> 2MgO-601.2 Kj/mol-601.2Kj/mole2.MgO + 2HCl -> MgCl2 +H2O8.2 Kj/mol-16.4Kj/mole3.Mg + 2HCl -> MgCl2 +H2-306.6 Kj/mol-613.2Kj/mole4.2H2 + O2 -> 2H2O-571.6 Kj/mol-571.6 Kj/mole(eq.2) + (eq.3) + (eq.4) = (eq.1)Changes:Eq.2 Flip and multiply by twoEq.3 Keep and Multiply by twoEq.4 keep allData:Trial 1:1.Mass of magnesium oxide: 1.00g2.Volume 1M HCL : 100ml3.Min. Temp: 26C4.Max Temp.: 33C5.Mean Temp: 31C6.Temperature vs Time(ms) graph of the reaction.Calculations:1.Change in temperature = (max temp)-(min temp)a.33Cmax-26Cmin=7Cdifference2.= * *q m c delta Ta.Q=102.2*4.184*7b.q=2993.23 joules3.delta H = -qa.delta H=-2993.23/1000b.delta H=-2.99323Kj4.Moles MgO used = mass MgO used / Atomic Mass MgOa.1g/40.011g=.025 moles MgO used5.Delta H / Mole MgOa.a....
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This lab report was uploaded on 04/16/2008 for the course CHEMISTRY 201 taught by Professor Vipinpaliwal during the Fall '07 term at Milwaukee School of Engineering.

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Lab Experiment 3 9-20-07 revise - 9-20-07Ch...

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