Lesson_6_-_Example_Solutions-2009

# Lesson_6_-_Example_Solutions-2009 - Lesson 6 Example 6-1 A...

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Lesson 6 Example 6-1 A 132.10 mL glass vessel weighs 56.1035 g when evacuated and 56.2445 g when filled with the gaseous hydrocarbon acetylene at 749.3 mmHg and 20.02 o C. What is the molar mass of acetylene? What conclusion can you draw about its molecular formula? Basis: 56.2445 g – 56.1035 g = 0.141 g acetylene Data: P = 749 mmHg V = 132.10 mL T = 20.02 o C = 293.17 K R = 0.082058 L.atm/mol.K M C = 12 g/mol M H = 1 g/mol 1

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Lesson 6 26 L 1 mL 1000 atm 1 mmHg 760 ) mL 10 . 132 )( mmHg 3 . 749 ( ) K 17 . 293 )( K . mol / atm . L 082058 . 0 )( g 141 . 0 ( M PV mRT M RT M m nRT PV 2245 × × = = = = Molecular formula: C 2 H 2 2
Lesson 6 Example 6-2 Monocholoroethylene is used to make polyvinlylchloride (PVC). It has a density of 2.56 g/L at 22.8 o C and 756 mmHg. What is the molar mass of monochloroethylene? Basis : density of monocholoroethylene is 2.56 g/L at 22.8 C and 756 mm Hg Data: ρ = 2.56 g/L T = 22.8 o C = 295.95 K P = 756 mmHg = 0.9947 atm R = 0.082058 L.atm/mol.K 3

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Lesson 6 mol
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## This note was uploaded on 09/23/2010 for the course CHEM 103 taught by Professor Chem during the Fall '09 term at University of West Georgia.

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Lesson_6_-_Example_Solutions-2009 - Lesson 6 Example 6-1 A...

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