ch+12+and+18+practice+questions

ch+12+and+18+practice+questions - Chem 1B W08 - McKeachie...

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Chem 1B W08 - McKeachie Practice problems for ch 18 and 12 1. Assume four pennies are being tossed at the same time. Using entropy, determine the most likely combination of heads and tails which will result. 2. What is the sign of S for the following processes? a) Someone drops a stack of papers. b) Students come into a lecture hall and sit down for class. c) 2 NH 3 (g) 3 H 2 (g) + N 2 (g) d) Co(l) Co(s) e) Two solids, both at 0 K, are mixed together at 0 K. f) A sample of water is placed in the refrigerator. This water does not freeze. 3. Using S universe , determine if the synthesis of solid ammonium chloride (NH 4 Cl) from HCl gas and ammonia gas is spontaneous at 400.0 K. Depending on your result, determine a temperature at which the reaction is no longer spontaneous or becomes spontaneous as written. You may assume the enthalpy and entropy changes for the reaction do not depend on temperature. 4. Using G rxn , would the reaction of NO 2 (g) with itself to produce N 2 O 4 (g) be spontaneous at 570.0 K? Depending on your result, determine the temperature at which the reaction is no longer spontaneous or becomes spontaneous as written at these conditions. You may assume the enthalpy and entropy changes for the reaction do not depend on temperature. 5.
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This note was uploaded on 02/09/2011 for the course CHEM 1B taught by Professor King during the Spring '08 term at UC Irvine.

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ch+12+and+18+practice+questions - Chem 1B W08 - McKeachie...

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