# HW-Ch19 - HW-CH19 9th Edition CH19 Problems 14 38 78 86 8th...

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HW-CH19 9th Edition CH19 Problems: 14, 38, 78, 86 8th Edition CH19 Problems: 12, 36, 68, 82 14. In the temperature range 310 K to 330 K, the pressure p of a certain non ideal gas is related to volume V and temperature T by p = (24 : 9 J=K ) T V ° (0 : 00662 J=K 2 ) T 2 V : How much work is done by the gas if its temper- ature is raised from 315 K to 325 K while the pressure is held constant? 38. The following °gure gives the probability distri- bution for nitrogen gas. The scale of the hori- zontal axis is set by ° s = 1200 m=s . What are the (a) gas temperature and (b) rms speed of the molecules? 78. (a) An ideal gas initially at pressure p 0 under- goes a free expansion until its volume is 3.00 times its initial volume. What then is the ra- tio of its pressure to p 0 ? (b) The gas is next slowly and adiabatically compressed back to its original volume. The pressure after compression is (3 : 00) 1 = 3 p 0 . Is the gas monatomic, diatomic. or polyatomic? (c) What is the ratio of the aver- age kinetic energy per molecule in this °nal state to that in the initial state? 86. In an industrial process the volume of 25.0 mol
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