CHEM 2011 Study Guide - Midterm Guide: Chemical Potential, Heptane, Maxwell Relations
14 Mar 2013
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1. 000 bar = 1. 000 105 pa gas constant = 8. 314 j k!1 mol!1: an ideal gas undergoes a three step process; at the end of the process, the gas has been returned to its original state. For each step of the process, and for the cycle as a whole, indicate whether q, w, and )u are less than, equal to, or greater than zero by circling the correct answer. You will be graded on the internal consistency of your answers as well on the individual answers. (a) the first step is an adiabatic expansion against a constant external pressure. 0. 00 c = 273. 15 k q < 0 w < 0. )u > 0 (b) in the second step, the gas is heated at constant volume until it has been returned to its original temperature. )u = 0 q > 0 w > 0. [2] (c) the final step is an isothermal compression. q < 0 w < 0.
