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Lecture22

# Lecture22 - PHYSICS 220 Lecture 22 Temperature and Ideal...

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Lecture 22 Purdue University, Physics 220 1 Lecture 22 Temperature and Ideal Gas Textbook Sections: 14.1-14.3, 15.1-15.2 PHYSICS 220

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Lecture 22 Purdue University, Physics 220 2 Molecular Picture of Gas Gas is made up of many individual molecules Number density is number of molecules/ volume – N/V = /m is the mass density – m is the mass for one molecule Number of moles n = N / N A – N A = Avogadro’s number = 6.022 10 23 mole -1 – N A = number of molecules per mole – 1 mole = amount of substance that contains as many elementary entities as there are atoms in exactly 12 grams of carbon-12
Lecture 22 Purdue University, Physics 220 3 Atoms, Molecules and Moles 1 mole = 6.022 10 23 molecules (N A = Avogadro’s Number) N A = Number of atoms or molecules that make a mass equal to the substance's atomic or molecular weight in grams. 1 u = 1 atomic mass unit = (mass of 12 C atom)/12 – Approximately # of neutrons + # of protons – Atomic weight A 1 u = 1.66 10 -27 kg = 1gram/N A Mass of 1 mole of “stuff” in grams = molecular mass in u – E.g. 1 mole of N 2 has mass of 2 14 = 28 grams

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Lecture 22 Purdue University, Physics 220 4 iClicker Which contains more molecules ? A) A mole of water (H 2 O) B) A mole of oxygen gas (O 2 ) C) Same H 2 O O 2
Lecture 22 Purdue University, Physics 220 5 Question Which contains more atoms ?

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