Ex2_S06_ans

Ex2_S06_ans - Name _A. Key_ Problem Session _All_ Chem 114...

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Name __A. Key_________________ Problem Session _All_________ Chem 114 Exam 2 Dr. A. H. Martin Total Points = 100 February 24, 2006 Note: All calculations must be shown and all dependent variables (x's) must be defined for full credit. (6) 1. Write the K c and K p expressions for the following equilibria. CH 4 (g) + 2O 2 (g) CO 2 (g) + H 2 O(l) Κ χ = [ΧΟ 2 ] [ΧΗ 4 ][Ο 2 ] 2 Κ π = Π ΧΟ 2 Π ΧΗ 4 Π Ο 2 2 (Liquids are not included.) 3 Fe(s) + 4 H 2 O(g) Fe 3 O 4 (s) + 4H 2 (g) Κ χ = 2 ] 4 2 Ο] 4 Κ π = Π Η 2 4 Π Η 2 Ο 4 (Solids are not included.) (10) 2. Indicate whether the concentration of NO will increase , decrease , or remain the same , when the following stresses are placed on the equilibrium below for which ∆H rxn for the forward reaction is -16.4 kJ. 2 NOBr(g) 2NO(g) + Br 2 (l) a) Some NOBr is removed. __ decrease _________ b) Some Br 2 is added ____ no effect (liquid, will not effect the equilibrium)________________ c) The system is cooled. __ increase ______________ d) A catalyst is added. ___ no effect __________________ e) The pressure on the system is halved by doubling the volume. no effect (same number of gas molecules on each side) (8) 3. Give the correct chemical formula for the following. a) the conjugate acid of N 2 H 4 ____N 2 H 5 1+ _________________ b) the conjugate base of HOCN _____OCN 1- _______________ c) the conjugate acid of H 2 PO 4 1- ___H 3 PO 4 ____________ d) the conjugate base of (CH 3 ) 2 NH 2 1+ ___(CH 3 ) 2 NH______________ (9) 4. Write the appropriate ionization equilibria and the ionization constant expression for the following equilibria. a) the K
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Ex2_S06_ans - Name _A. Key_ Problem Session _All_ Chem 114...

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