# Lesson_6 - Gases Chapter 6(Petrucci et al Lesson 6 Gas laws...

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Lesson 6 Gases Chapter 6 (Petrucci et al.)

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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 g h A g A h A g V A g m A F P Hg Hg Hg Hg Hg Hg Hg . . . . . . . . ρ ρ ρ = = = = = 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 Measuring pressure with a open- end manometer

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Lesson 6 Boyle’s Law (1662)
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 =

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Lesson 6 Charles’s Law (18 th Century)
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