Experiment 8.docx - Experiment 8 Analysis of Two –...

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Experiment 8: Analysis of Two – Component Alloy Bana Alani Chem 141-8966 Oct 8, 2016 Lab Notebook /6 Data/Log/Observations /3 Signature and Stamp /1 Procedure /2 Formal Report /59 Title Page /2 Objective /2 Data Summary/ Calculations /10 Discussion /15 Conclusion /6 Post lab questions /24 Computer Printout /35 Total /100
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Objective To determine the percentage of mass for each metal presents in a sample of zinc – aluminum alloy by combining stoichiometry and the Ideal Gas Law as follows: o Apply the Ideal Gas Law to determine the total number of moles of hydrogen gas produced by the reaction of zinc – aluminum alloy sample with hydrochloric acid solution. o Apply stoichiometry to determine the mass of each metal based on the calculated number of moles of hydrogen gas. Results and Calculations Table 1: Measurements Taken for Each Trial Measurements Trial 1 Trial 2 Mass of sample 4.7539 g 3.0699 g Water level difference (ΔH) 7.70 mmH 2 O 3.60 mmH 2 O Temperature of gas above the water 23.0 o C 23.0 o C Mass of water displaced by hydrogen gas 3093 g 2556 g Zn (s) + 2 HCl (aq) ZnCl 2 (aq) + H 2 (g) (Eq. 1) 2 Al (s) + 6 HCl (aq) 2 AlCl 3 (aq) + 3 H 2 (g) (Eq. 2) PV = nRT (Eq. 3) P bar = P H2O + P H2 ± P ∆h (Eq. 4) Since we were using zinc – aluminum alloy, then: mass Zn + mass Al = mass alloy
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mass Al = mass alloy – mass Zn (Eq. 5) Both metals, Zn and Al, react with HCl solution and produce H 2 gas. mol H 2 from Al + mol H 2 from Zn = mol H 2 collected (Eq. 6) Based on the balanced chemical reactions between each metal and HCl solution (Eq. 1 and 2), we calculate the number of moles of H 2 gas produced by using stoichiometry as follows: mol H 2 from Zn = massZn× 1 mol Zn 65.382 g Zn × 1 mol H 2 1 mol Zn (Eq. 7) mol H 2 from Al = mass Al × 1 mol Al 26.982 g Al × 3 mol H 2 2 mol Al (Eq. 8) Substituting equation 5 into equation 8 gives: mol H 2 from Al = ( massalloy massZn ) × 1 mol Al 26.982 g Al × 3 mol H 2 2 mol Al (Eq. 9) The number of moles of H 2 gas produced by the alloy sample can also be calculated using the Ideal Gas Law as follows: n = PV RT (Eq.
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