Chemistry 2214A/B Lecture Notes - Lecture 6: Radio National, Joule, Ideal Gas
22 Jan 2015
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= -1. 729 kj q = -wrev = 1. 729 kj: wirr = -nrt[1 - (p2/p1)] = -1. 247 kj q = - wirr = 1. 247 kj. The gas does maximum work if the expansion process is reversible. There are many irreversible pathways: e. g. the system can go from the initial to the final state in multiple steps: From p1 = 10 bar to an intermediate state of pint = 7 bar in one step. From 7 bar to p2 = 5 bar in one step. (ii) (i) If the number of steps becomes infinite and the size of the step becomes infinitesimally small, the sum of all steps becomes a reversible process. Consider the compression of 1 mol of ideal gas from 5 bar to 10 bar at 300 k. calculate w when it is carried out reversibly and irreversibly. Note: work done is the same as in the reversible expansion except for the (+) sign => the process is reversible.
