ISU CHEM 178 - CHEM_178_Verkade_kbruning_Equilibrium_Constants_9-9-10

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Chapter 15:Equilibrium ConstantsSupplemental InstructionIowa State UniversityLeader: KelseyCourse: Chemistry 178Instructor: VerkadeDate: 09/09/2010PV =nRTKp=Kc(RT )∆ n1. Write the general form of the equilibrium constant, Kc, for the general reaction:aA + bB  cC + dD2. What is the difference between Kc and Kp? Are they equal for a given reaction? Write the general form for Kp (for the above reaction). 3. Write the expression for Kc for the following reaction. Indicate whether the reaction is homogenous or heterogeneous. 2 Ag(aq)+¿←→+Zn(s)2+¿¿2 Ag(s)+Zn(aq)¿4. Write the equilibrium expression for Kc and Kp for the following reactions:a. 2H2(g) + O2(g)  2H2O(g)b. NH3(aq) + H2O(l)  NH4+(aq) + OH-(aq)5. When the following reaction comes to equilibrium, does the equilibrium mixture contain mostly reactants or mostly products? N2(g)+O2( g)2 NO(g)←→; Kc=1.5 ×10−10 Supplemental Instruction1060 Hixson-Lied Student Success Center v 294-6624 v www.si.iastate.edu6. What is Δn for the reaction: N2O4(g) == 2NO2(g)? If Kp has a value of 0.140 at 25 degrees C, calculate the value of Kc. 7. If Kc=0.042 for PCl3(g)+Cl2( g)PCl5( g)←→ at 500K, what is the value of Kp for this reaction at this temperature? 8. True or False? The effect of a catalyst in a chemical reaction is to react with product, effectively removing it and shifting the equilibrium to the right.9. At 1285 °C the equilibrium constant for the reaction Br2(g)2 Br(g )←→ is Kc = 1.04 × 10–3. A 0.200-L vessel containing an equilibrium mixture of the gases has 0.245 g Br2(g) in it. What is the mass of Br(g) in the


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