Physics 1 Problem Solutions 168

Physics 1 Problem Solutions 168 - PV = nRT where P is...

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Chapt. 20 Thermodynamics II: Microscopic View Multiple-Choice Problems 020 qmult 00100 1 5 3 easy thinking: mole defned 1. We defne the mole or Avogadro’s number to be N A = 1 g a , where a is the atomic mass unit (amu) (measured in grams) which is defned to be exactly 1 / 12 oF the mass oF a carbon-12 ( 12 C) atom. Now the atomic/molecular mass oF an atom or molecule is A which is the mass measured in atomic mass units. It Follows From the defnition oF the mole that the number oF moles oF particles with atomic/molecular mass A in a sample oF those particles with a mass oF A grams is: a) A . b) 1 /A . c) 1. d) N A . e) 1 /N A . 020 qmult 00110 1 1 4 easy memory: moles 2. You have 32 grams oF molecular oxygen, O 2 (each molecule having containing 16 protons and 16 neutrons altogether). How many moles oF O 2 do you have? a) 32 moles. b) 2 moles. c) 16 moles. d) 1 mole. e) None. 020 qmult 00200 1 3 4 easy math: ideal gas law Extra keywords: physci iF moles are introduced 3. The ideal gas law is obeyed by ordinary gases to some degree:
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Unformatted text preview: PV = nRT , where P is pressure, V is volume, n is the number oF moles, R is the gas constant, and T is temperature on the Kelvin scale. In the limit oF vanishing density all ordinary gases are obey the ideal gass law exactly. Say we keep some gas at constant temperature (isothermal) and constant number oF moles (iso-something) and double its volume. The pressure: a) doubles. b) goes to zero. c) increases. d) halves. e) goes to infnity. 020 qmult 00210 2 3 5 moderate math: ideal gas and pressure Extra keywords: physci KB-129-6 4. The ideal gas law obeyed by all su±ciently dilute gases is PV = NkT , where P is pressure, V is volume, N is the number oF molecules, k is the Boltzmann’s constant, and T is temperature on the Kelvin scale. Say we keep some gas at constant volume. The pressure is then : a) 100 Pa. b) infnite. c) proportional to molecule size. d) zero. e) proportional to temperature....
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