realtest2

# realtest2 - The following constants may be useful R =...

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Sheet1 Page 1 The following constants may be useful: R = 0.08206 liter-atm/mole-K Equilibrium Constants for Reactions in Water at 25.0ºC Kw = 1.0 x 10-14 Ka(HF) = 7.2 x 10-4 Ka(NH4+) = 5.6 x 10-10 Ka(HOCl) = 3.5 x 10-8 Ksp(PbCl2) = 1.6 x 10-5 pKa's of Selected Indicators Indicator, pKa ethyl orange , 4.1 propyl red , 5.7 neutral red , 7.2 thymol blue , 8.8 alizarin yellow , 11.0 Clayton yellow , 12.7 (35 points) Nitric oxide is prepared industrially by the oxidation of ammonia in the presence of catalytic platinum: 4 NH3(g) + 5 O2(g) = 4 NO(g) + 6 H2O(g) The equilibrium constant, Kp, for the reaction is 1.2 x 1068 and 1.0 x 1036 at 25.0ºC and 100.0ºC, respectively. A large initially empty vessel maintained at 100.0ºC is filled with 15 atm of ammonia and 25 atm of oxygen. Calculate the e The equilibrium constant is very large and oxygen is in excess. Virtually all of the ammonia is oxidized. pNO = (4/4)pNH3 = Kp = (pH2O6)(pNO4)/ (pO25)(pNH34) Substituting in the known quantities and solving for the concentration of ammonia, one obtains 1.6 x 10-7 atm. Is the reaction exothermic or endothermic? Briefly explain.

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realtest2 - The following constants may be useful R =...

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