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# Exset6 - Nielsen CHM1041 Exercise Set 6 General Equilibria...

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Nielsen Bhaskar/PC/1713H/K 2/05 1 CHM1041 Exercise Set 6 General Equilibria 1. Why is a chemical equilibrium referred to as a dynamic equilibrium? 2. Write the expressions for the equilibrium constant for the following equilibria: K a) 2 2 N + O 2 NO U b) 2 2 2 SO O 2 SO + U 3 S 2 2 c) 8 S 8 U d) 4 2 2 CH + 2 H S CS + 4 H U e) 3 2 4 NH + 5 O 4 NO + 6 H O U 3. The equilibrium constants for four different reactions are 1.3 , Assuming that each reaction can be represent an equilibrium mixture essentially composed of just two substances? × 10' -21 -2 12 2.6 × 10 , 4.7 × 10 , and 1.8 × 10 . 4. A mixture of 0.0080 mole of ( ) ( ) 2 SO g and 0.0056 mole of O g 2 0 + 0 2 S0 U and O ? g PC1 . g of C1 is placed in a one-liter container at 1000° When equilibrium is established, 0.0040 mole of K. ( ) 3 g S0 is present. 2 S ( ) ( ) ( ) 2 g 2 g 3 g a) What are the equilibrium concentrations of SO ( ) ( ) 2 g 2 g b) What is the value of K for the equilibrium at 1000°K? 5. Into a 5.00 liter flask was placed 35.7 The flask and contents were heated to and then held at that temperature until the following equilibrium was established: 5 250°C ( ) ( ) ( ) 5 g 3 g 2 g PC1 PC1 + C1 U It was then shown by analysis that 8.75 was present in the equilibrium mixture.

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