Lab Experiment 5 - 10-5-07 Ch 200-42 Experiment Five...

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10-5-07 Ch 200-42 Experiment Five Determining Atomic Mass of Aluminum Purpose:
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The purpose of this experiment is to determine the atomic weight of aluminum by reacting it with an acid and measuring the Hydrogen gas that is formed. Equations: 1.) Law of Partial Pressures - [P1 + P2 = ∑P] 2.) Ideal Gas Law – PV = nRT 3.) P in = P out 4.) 2Al (s) + 6HCl (l) → 2AlCl 3(aq) + 3H 2 Trial one: Data and Calculations: Data: 1. Ambient Pressure 749.6 mm Hg 2. Volume H2O Displaced 0.419 L 3. Temperature H2O 24.9 ®C 4. Vapor Pressure 3.169 mmHg 5. Mass Al 0.30 g Al Calculations: Eq. 3 P in = P out P in = 749.6 mmHg = 0.9863 atm Eq. 1 ∑P in = P H 2 + P H 2 O (v) = 0.9863 atm 0.9863 atm – 0.00417 atm = .98213 atm =P H 2 Eq. 2 PV = nRT 0.98213 atm x .419 L = n .082 x 297.9 Solve for n = 0.017 moles H 2 Moles Al Moles H 2 x (2 Moles Al/ 3 Moles H 2 ) = Moles Al used n = 0.01123 moles Al Atomic Mass Al Mass of Al used / Moles Al used = Molar Mass of Al 0.3g Al/0.01123 moles Al = 26.714 g/ mole
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Lab Experiment 5 - 10-5-07 Ch 200-42 Experiment Five...

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