Ex2_S08_key - Name_A KEY Problem Session_ALL Chem 114 Exam...

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Name _____A. KEY_____________ Problem Session ____ALL_________ Chem 114 Exam 2 Dr. A. H. Martin Total Points = 100 February 22, 2008 Note: All calculations must be shown and all dependent variables (x's) must be defined for full credit. (6) 1. Write the expressions for the following equilibria. a) The K p for 4 NH 3 (g) + 5 O 2 (g) 4 NO(g) + 6 H 2 O(g) Κ π = ΝΟ 29 4 (P H 2 O ) 6 (P NH 3 ) 4 (P O 2 ) 5 b) The K c for 4 H 3 O 1+ (aq) + 2 Cl 1- (aq) + MnO 2 (s) Mn 2+ (aq) + 6 H 2 O(l) + Cl 2 (g) Κ χ = [Μν 2+ ][Cl 2 ] [H 3 O 1+ ] 4 [Cl 1- ] 2 (Note: MnO 2 solid and liquid water are not included.) (10) 2. Indicate whether the concentration of CO 2 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 +599 kJ. 2 N 2 (g) + CO 2 (g) 2 N 2 O(g) + C(s) a) Some N 2 is removed. __Increase_______________ b) Some N 2 O is added ___Increase__________________ c) The system is heated. ____Decrease________________ d) A catalyst is added. ______Stays the same_______________ e) The pressure on the system is doubled by halving the volume. ___Decrease (solid C is ignored)________ (8) 3. Give the correct chemical formula for the following. a) the conjugate base of HNO 2 __NO 2 1- _____________ b) the conjugate acid of HSO 3 1- _____H 2 SO 3 _____________ c) the conjugate acid of (CH 3 ) 3 NH __(CH 3 ) 2 NH 2 1+ ____________ d) the conjugate base of PO 4 3- ________HPO 4 2- ________________ (9) 4. Write the appropriate dissociation equilibria and the dissociation constant expression for the following equilibria.
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