equilibrium chem. assignment Westdale 2008 - Assignment 7A EQUILIBRIUM We can be sure that the greatest hope for maintaining equilibrium in the face of

# equilibrium chem. assignment Westdale 2008 - Assignment 7A...

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Assignment 7A: EQUILIBRIUM We can be sure that the greatest hope for maintaining equilibrium in the face of any situation rests within ourselves. Frances Braceland, 2003 1) For the following reaction. 3(g) (g) 4 (s) NH HCl NH Cl  a) Is the reaction spontaneous at 25°C ? The 3(g) f H for NH 45.9 kj/mol   o , (g) f H for HCl 92.3 kj/mol   o , and 4 (g) f H for NH Cl 314.4 kj/mol   o . The S o for 3(g) (g) 4 (s) NH , HCl , NH Cl are respectively 192.78 J/mol K g , 186.90 J/mol K g , and 94.6 J/mol K g b) Determine the temperature at which the reaction is no longer spontaneous. 2) For the reaction , 2(l) 2(g) Br Br  , f H o for 2(g) Br 30.9 kJ/mol   and S o for 2(l) Br 152.2 J/mol K g and 2(g) Br 245.4 J/mol K g respectively. Assuming that H and S are nearly independent of temperature, calculate the approximate temperature at which 2(l) Br will be in equilibrium with 2(g) Br at 1 atm. 3) Write the equilibria constant for each of the following reactions (pg. 335). a) 2 2(g) 3 (g) (g) N 3H 2NH   b) (s) 2(g) (g) 2C O 2CO   c) 3(s) 2 3(s) 2 (g) 2(g) 2NaHSO Na SO H O SO   4) At a certain temperature a mixture of 2 H and 2 I was prepared by placing 0.100 mol of 2 H and 0.100 mol of 2 I into a 1.00 L flask. After a certain period of time the following equilibrium was established. 2(g) 2(g) (g) H I 2HI ? ? At equilibrium the concentration of 2 H had dropped to 0.02 mol/L.What is the value of c K at this temperature? (ans: 64) 5) The reversible reaction 4(g) 2 (g) (g) 2(g) CH H O CO 3H   has been suggested as a possible source of hydrogen. At 1500C, an equilibrium mixtures was found to have the following concentrations: [CO] = 0.300M , 2 [H ] = 0.800M , and 4 [CH ] = 0.400M . At 1500C, c K is 5.67. What was the equilibrium concentration of 2 H O in this mixture. (ans: 0.0677) 6) The equilibrium constant, c K , for this reaction was found to be 0.500 at a certain temperature. 3(g) (g) 2 2(g) (g) SO NO NO SO   If 0.300 mol of (g) NO and 0.300 mol of 3 SO was placed in a 2.00 L container and allowed to react, what would be the equilibrium concentration of each gas? (pg. 344) (ans: 0.088, 0.088, 0.062, 0.062) [3] [3] [4] [3] [3] [3] [3] 21

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