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Unformatted text preview: Gadhia, Tejas – Homework 4 – Due: Oct 3 2007, 11:00 pm – Inst: James Holcombe 1 This printout should have 26 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points K c = 9 . 7 at 900 K for the reaction NH 3 (g) + H 2 S(g) → NH 4 HS(s) . If the initial concentrations of NH 3 (g) and H 2 S(g) are 2.0 M, what is the equilibrium concentration of NH 3 (g)? 1. 1.9 M 2. 1.7 M 3. 0.20 M 4. 0.10 M 5. 0.32 M 002 (part 1 of 1) 10 points For the reaction POCl 3 (g) * ) POCl(g) + Cl 2 (g) K c = 0 . 30. An initial 0 . 38 moles of POCl 3 are placed in a 2 . 2 L container with initial concentrations of POCl and Cl 2 equal to zero. What is the final concentration of POCl 3 ? ( Note: You must solve a quadratic equation.) 1. final concentration = 0 . 100227 M 2. final concentration = 0 . 0501137 M 3. final concentration = 0 . 391727 M 4. final concentration = 0 . 219 M 5. final concentration = 0 . 123 M 003 (part 1 of 1) 10 points The equilibrium constant for thermal dissoci ation of F 2 into atoms is 0.300. If 1 . 18 moles of F 2 are placed in a 1.00 liter container, how many moles of F 2 have dissociated at equilib rium? Answer in units of mol. 004 (part 1 of 1) 10 points Consider the equilibrium A(g) * ) 2B(g) + 3C(g) at 25 ◦ C. When A is loaded into a cylinder at 10 . 7 atm and the system is allowed to come to equilibrium, the final pressure is found to be 15 . 28 atm. What is Δ G ◦ r for this reaction? Answer in units of kJ / mol. 005 (part 1 of 1) 10 points When 0 . 0172 mol HI is heated to 500 K in a 2 L sealed container, the resulting equilibrium mixture contains 1 . 9 g of HI. Calculate K c for the decomposition reaction 2HI(g) * ) H 2 (g) + I 2 (g) . 006 (part 1 of 1) 10 points Suppose the reaction H 2 (g) + I 2 (g) * ) 2HI(g) has an equilibrium constant K c = 49 and the initial concentration of H 2 and I 2 is 0.60 M and HI is 0.0 M. Which of the following is the correct value for the final concentration of HI(g)?...
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 Spring '07
 Holcombe
 Equilibrium, Reaction, Chemical reaction, Kc

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