201GasLaws

# 201GasLaws - Gases Chapter 6(Petrucci et al Lesson 6 Gas...

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Lesson 6 1 Lesson 6 Gases Chapter 6 (Petrucci et al.) Lesson 6 Gas laws • Gas laws are mathematical equations relating the volume to the number of moles, temperature and pressure of gases: V = f ( n , T , P ) • The function f ( n , T , P ) is relatively simple for gases because intermolecular forces in gases are generally very weak • Ideal gas law: PV = nRT The ideal gas law does not take into account gas type. Is this a reasonable hypothesis? Lesson 6 Definition of pressure P = force / area • Which force? – Force resulting from the collision of the gas molecules against the walls of the container • Which area? – Area of the walls of the container holding the gas

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Lesson 6 2 Lesson 6 g h A g A h A g V A g m A F P Hg Hg Hg Hg Hg Hg Hg . . . . . . . . A g m A F P air air air . P Hg = P air h = 76 cm Hg = 760 mm Hg = 760 torr = 1 atm (0 o C) m hg = m air Lesson 6 Petrucci et al. Measuring pressure with a open- end manometer Lesson 6 Boyle’s Law (1662) Petrucci et al.
Lesson 6 3 Lesson 6 Boyle’s Law • The product PV of a gas is constant for a given temperature and amount of substance: PV = nC • Therefore: P nC V Lesson 6 Charles’ Law (18 th Century) Lesson 6 Charles’ Law (18 th Century) The volume of a gas is a linear function of its temperature: c

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## This note was uploaded on 11/29/2011 for the course CHE 102 taught by Professor Simon during the Fall '08 term at Waterloo.

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201GasLaws - Gases Chapter 6(Petrucci et al Lesson 6 Gas...

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