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phys 369 09 hw 7 Solutions

phys 369 09 hw 7 Solutions - Phys 369 Fall 2009 Homework#7...

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1 Phys. 369, Fall 2009 Homework #7 Solutions 1. (12 points)
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2 2. (12 points) 3. (14 points) a) The volume of the gas is ( ) 3 3 3 3 3 1000 cm 1 m 1 liter 1.0 10 m . liter 100 cm V = × × = × Its pressure is 5 5 Pa 3 atm 1.013 10 3.09 10 Pa. atm P = × × = × The number of atoms is 5 3 22 23 3.09 10 10 3.73 10 . 1.381 10 600 PV N kT × × = = = × × × Helium is a monatomic nearly ideal gas, so the internal energy of the gas is 22 23 3 1.5 3.73 10 1.381 10 600 463 J 2 U NkT = = × × × × × = The mass of a helium atom is 27 27 4 u 4 1.661 10 kg 6.64 10 kg. m = = × × = ×
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