Lect+3+08 - Objectives for Lecture 3 A plain language...

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Objectives for Lecture 3 A plain language understanding of the The Behavior of Ideal Gases PV = nRT Boyle’s Law: PV = constant (T constant) Charle’s Law: V/T= constant (P constant) Avogadro's law: V/n= constant (T, P constant) The Absolute (Kelvin) Temperature Scale Ideal Gas Law: PV = net combines all four concepts Ideal gas properties and utility Two state ideal gas problems Reactions involving gases
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IDEAL GAS BEHAVIOR PV = nRT P is pressure in pascals V is the volume in cubic meters n is the number of moles R is the gas constant (8.3145J/mol K) T is the temperature in Kelvin
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IDEAL GAS BEHAVIOR At T = 0 K ;V = 0 ideal gas particles do not have volume At T = 0 K; ideal gas particles do not have attractive interactions so no condensation Ideal gas behavior provides a very helpful standard for many areas of science
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Air is a familiar example of a gas mixture which is nearly ideal
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Boyles Law: Pressure- Volume Relationship 1.00g of O 2
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Boyles Law: Pressure-volume Relationship 1.000g of O 2 Increase pressure to 1.0 atm -volume decreases by a factor of 2 PV product is constant (constant T)
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Gas Pressure-Volume Relationship
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Avogadro's Law: V/n= constant (P,T) Equal volumes of different gases contain the same number of molecules if the temperature and pressure are the same. 22.4 L of any ideal gas contains 1 mole of molecules at STP STP is standard temperature and pressure: P = 1 atm, T = 273 K 2 H 2 (g) + O 2 (g) 2 H 2 O (g) 2 moles + 1 mole 2 moles 2 Liters + 1 Liter 2 Liters
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