Lab Experiment 5

# Lab Experiment 5 - Ch 200-42 Experiment Five Determining...

This preview shows pages 1–3. Sign up to view the full content.

10-5-07 Ch 200-42 Experiment Five Determining Atomic Mass of Aluminum Purpose:

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

Lab Experiment 5 - Ch 200-42 Experiment Five Determining...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online