Chem 2 chap 13 hmwk - 2 and[I for the reaction I 2 g 2I g...

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Assignment #4, CHAPTER 13 – Equilibrium Theory 1. Write equilibrium constant expressions (K c ) for the following: a. AgCl( s ) + 2 NH 3 ( aq ) [Ag(NH 3 ) 2 ] + ( aq ) + Cl - ( aq ) K = [Ag(NH 3 ) 2 + ] [Cl - ] [NH 3 ] 2 b. CO 2 ( g ) + C( s ) 2CO( g ). K = [CO] 2 [CO 2 ] 2. What is the value of K c for the reaction 2A( g ) B( g ) + 2C( g ) if only A is present initially and [A] at equilibrium is 30.0% of the original concentration of A, which was 2.00 M? ICE A B C I 2.00 0 0 C -1.40 +0.70 1.40 E (.30)(2.00) = 0.6 0.70 1.40 K = (0.70x1.40 2 ) = 3.81 0.6 2 3. A closed flask is set up in which only substance C is present with an initial concentration of 0.80 M. When a state of equilibrium is reached in the reaction C D + 2E, the equilibrium concentration of C is 0.20 M. What are the equilibrium concentrations of D and E? ICE C D E I 0.80 0 0 C -0.60 +0.60 1.20 E 0.20 0.60 1.20 4. If K c = 2.0 x 10 6 at 100°C for the reaction 2SO 2 ( g ) + O 2 ( g ) 2SO 3 ( g ), then what is the value of K c for the reaction 2SO 3 ( g ) 2SO 2 ( g ) + O 2 ( g )? K = [SO 2 ] 2 [O 2 ] = 1/(2.0 x 10 6 ) = 5.0 x 10 -7 [SO 3 ] 2
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5. What are the equilibrium concentrations [I
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Unformatted text preview: 2 ] and [I] for the reaction I 2 ( g ) 2I( g ) if the initial concentrations are 2.0 x 10-1 M I 2 , 0 M I, and K c = 4.0 x 10-2 ? ICE I 2 I I 0.20 C-x +2x E 0.20-x 2x 0.040 = (2x) 2 4x 2 + 0.04x -0.008 = 0 0.20-x x = +0.04 ; -0.05 So [I 2 ] eq = 0.20 -0.04 = 0.16M [I] eq = 2(0.40) = 0.80M 6. For the reaction below, H o rxn = +508 kJ. 2 POCl 3 ( g ) 2 PCl 3 ( g ) + O 2 ( g ) Indicate the direction (to reactants, to products, no change) that the equilibrium will shift when a) [POCl 3 ] is increased __ to products ___ b) O 2 is removed ____ to products ___ c) the pressure is increased by decreasing the volume ____ to reactants ___ d) a catalyst is added ____ no change _______ e) the temperature is reduced ______ to reactants ______ f) the pressure is increased by adding argon __ no change __...
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Chem 2 chap 13 hmwk - 2 and[I for the reaction I 2 g 2I g...

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