CH302%20quiz%203%20answer%20key%20sp08

CH302%20quiz%203%20answer%20key%20sp08 - 1 CH302 Quiz 3...

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1 CH302 Quiz 3 Answer Keys (20pts.) Q# 1(10 pts.) Consider the following reaction: A + B 2 C (all gases) K c = 2.0 What are the equilibrium concentrations of the reactants if 10.0 moles of A & B and 15.0 moles of C are added to a 5.00 L container? a) 2.833 M b) 2.945 M c) 2.0528 M d) 2.0663 M e) 2.00890 M () 2 2 2 10.0 [] 2 . 0 0 5.00 15.0 3 . 0 0 5.00 3.00 9 . 0 0 2.25 [ ][ ] (2.00) 4.00 2 2.00 2.00 3.00 2 2.00 2.00 initial initial initial c cc moles AB M L moles CM L C Q Q K reaction shifts to left C initial M M M rxn x x x equil x M == = = = > → + ← ∆+ + + ( ) 2 2 2 3.00 2 3.00 2 2.0 2.00 3.00 2 1.41 2.00 2.82 1.41 3.00 2 3.41 0.180 0.0528 c x Mx M C K x x x x xx x x +− = = + = + += = = ( ) ( ) [ ] [ ] 2.00 2.00 0.0528 2.05 [ ] 3.00 2 3.00 2(0.0528) 2.89 A Bx M M M Cx M M M + = + = =− =
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2 Q# 2 (10 pts.) Consider the following reaction: A + B 2 C (all gases) It has been established that the equilibrium concentration of the reactants and products are [A] = 0.080 M [B] = 0.060 M [C] = 0.490 M
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This note was uploaded on 09/20/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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CH302%20quiz%203%20answer%20key%20sp08 - 1 CH302 Quiz 3...

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