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Unformatted text preview: Phys 111 Fall 2008 General Physics: Class Exam 3 14 November 2008 Name: Total: /50 Instructions • There are 7 questions on 5 pages. • Show your reasoning and calculations and always justify your answers. Physical constants and useful formulae g = 9 . 81m/s R = 8 . 314J/mol K N A = 6 . 02 × 10 − 23 /mol k B = 1 . 38 × 10 − 23 J/K P atmos = 1 . 01 × 10 5 Pa T = T C +273 . 15 T F = 9 5 T C +32 V = l 3 (cube) V = 4 3 πr 3 (sphere) Question 1 A cubic container has sides of length 1 . 00m and contains pure nitrogen gas at atmospheric pressure and a temperature of 20 ◦ C . Determine the number of moles of nitrogen in the container. Use the fact that the molar mass of molecular nitrogen gas is 28g to determine the mass of the gas inside the container. /6 Question 2 Two balloons are each filled with helium, whose molar mass is 0 . 004kg. Balloon A contains one mole and balloon B contains four moles. The balloons are at exactly the same tempera- ture. Which of the following is true regarding the typical speed (root mean square velocity)ture....
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This note was uploaded on 06/21/2011 for the course MATHEMATIC 135 taught by Professor Phystago during the Spring '11 term at Waterloo.
- Spring '11