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Unformatted text preview: HWCH19
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 86. In an industrial process the volume of 25.0 mol of a monatomic ideal gas is reduced at a uniform rate from 0.616 m3 to 0.308 m3 in 2.00 h while its temperature is increased at a uniform rate from T2 T 27.0o C to 450 o C. Throughout the process, the p = (24:9J=K) (0:00662J=K 2 ) : V V gas passes through thermodynamic equilibrium states. What are (a) the cumulative work done How much work is done by the gas if its temperon the gas, (b) the cumulative energy absorbed ature is raised from 315 K to 325 K while the by the gas as heat, and (c) the molar speci...c heat pressure is held constant? for the process? (Hint: To evaluate the integral 38. The following ...gure gives the probability distrifor the work, you might use bution for nitrogen gas. The scale of the horiZ bx aB bA a + bx zontal axis is set by s = 1200m=s. What are dx = + ln(A + Bx); A + Bx B B2 the (a) gas temperature and (b) rms speed of the molecules? an inde...nite integral.) Suppose the process is replaced with a twostep process that reaches the same ...nal state. In step 1, the gas volume is reduced at constant temperature, and in step 2 the temperature is inceased at constant volume. For this process, what are (d) the cumulative work done on the gas, (e) the cumulaive energy absorbed by the gas as heat, and (f) the molar speci...c heat for the process? 78. (a) An ideal gas initially at pressure p0 undergoes a free expansion until its volume is 3.00 times its initial volume. What then is the ratio of its pressure to p0 ? (b) The gas is next slowly and adiabatically compressed back to its original volume. The pressure after compression is (3:00)1=3 p0 . Is the gas monatomic, diatomic. or polyatomic? (c) What is the ratio of the average kinetic energy per molecule in this ...nal state to that in the initial state? 1 ...
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This note was uploaded on 05/14/2011 for the course ECON 101 taught by Professor Asdaf during the Spring '11 term at Universidad de San Buenaventura Bogota.
 Spring '11
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