Lecture22_Pushkartentative

# Lecture22_Pushkartentative - PHYSICS 220 Lecture 22...

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Lecture 22 Purdue University, Physics 220 1 Lecture 22 Temperature and Ideal Gas 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 of moles n = N / N A N A = Avogadro’s number = 6.022 × 10 23 mole -1 N A = number of particles (can be atoms or molecules) per mole 1 mole = amount of substance that contains as many elementary entities as there are
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 Question Which contains more atoms ? B) A mole of water (H O) H O (3 atoms) O (2 atoms)
Purdue University, Physics 220 5 Question Which weighs more ? A)

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## This note was uploaded on 04/10/2011 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue.

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Lecture22_Pushkartentative - PHYSICS 220 Lecture 22...

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