PHYS 1007 Lecture Notes - Lecture 22: Unified Atomic Mass Unit, Ideal Gas Law, Molar Volume
9 Apr 2016
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Molar mass m: mass in grams of the atomic mass/molecular mass. Deines 1 mol of a substance: which contains avogadro"s number of atoms/molecules (na) For a sample of total mass m, the number of moles are m/m = n. For a sample containing n atoms, the number of moles are n/na = n. To ind the actual mass of the atom, muliply the atomic mass by u": u" is the atomic mass unit = 1. 66 x 10-27 kg. Molar volume for gas at stp is zero degrees celsius, at 101. 3 kpa: 22. 4 l contain na atoms/molecules. Some scienists did experiments with balloons illed with gas in cold and hot condiions. They found that if the temperature increased, the volume increases assuming constant p. When temperature gets to -273 degrees celsius or absolute zero then volume is zero ie. can"t exist. They found that as you increase pressure from like a piston on a sealed container, the volume goes down.
