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1178564859Xuj

# 1178564859Xuj - Anderson Kiel Exam 2 Due Mar 8 2007 noon...

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Anderson, Kiel – Exam 2 – Due: Mar 8 2007, noon – Inst: McCord 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. 001 (part 1 oF 1) 10 points The standard molar Gibbs Free energy oF For- mation oF NO 2 (g) at 298 K is 51.30 kJ · mol - 1 and that oF N 2 O 4 (g) is 97.82 kJ · mol - 1 . What is the equilibrium constant at 25 C For the reaction 2NO 2 (g) * ) N 2 O 4 (g)? 1. 6.88 correct 2. 7 . 01 × 10 - 9 3. 9 . 72 × 10 9 4. None oF these 5. 1.00 6. 0.657 7. 0.145 8. 1 . 02 × 10 - 10 Explanation: Δ G 0 products = 97 . 82 kJ · mol - 1 Δ G 0 reactants = 51 . 30 kJ · mol - 1 Δ G 0 rxn = X n Δ G 0 products - X n Δ G 0 reactants = 97 . 82 - (2)(51 . 30) = ( - 4 . 78 kJ / mol) µ 1000J kJ = - 4780 J / mol Δ G 0 = - R T ln K K = e - Δ G 0 / ( R T ) = exp - - 4780 J / mol (8 . 3145 J / mol · K)(298 K) = 6 . 88395 002 (part 1 oF 1) 10 points CS 2 and Cl 2 react according to the Following equation CS 2 (g) + 3Cl 2 (g) * ) S 2 Cl 2 (g) + CCl 4 (g) . When 2.0 mole oF CS 2 and 4.00 moles oF Cl 2 are placed in a 2.00 liter container and allowed to come to equilibrium, the mixture is Found to contain 0.50 moles oF CCl 4 . What is the amount oF Cl 2 at equilibrium? 1. 2.25 mol Cl 2 2. 0.50 mol Cl 2 3. 0.75 mol Cl 2 4. 1.50 mol Cl 2 5. 2.75 mol Cl 2 6. 2.50 mol Cl 2 correct 7. 0.25 mol Cl 2 Explanation: Use stoichiometry to solve this. IF 0.50 moles oF CCl 4 were Formed, then 3 times that amount oF Cl 2 must have reacted (note 3:1 ratio), so 3(0.5 mol) = 1.5 moles oF Cl 2 reacted and thereFore 2.50 moles remain. 003 (part 1 oF 1) 10 points Which oF the Following anions is the strongest base, according to the Bronsted-Lowry the- ory? 1. Cl - 2. NO - 3 3. I - 4. ClO - 3 5. None oF the anions listed is a base.

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Anderson, Kiel – Exam 2 – Due: Mar 8 2007, noon – Inst: McCord 2 6. F - correct Explanation: HCl, HNO 3 , HI and HClO 3 are strong acids with very weak Bronsted-Lowry bases. HF is a weak acid and an appreciable amount of it remains in solution as the unionized acid. 004 (part 1 of 1) 10 points Suppose the reaction A + 3B 2C has a value of K = 10 . 0 at a certain tempera- ture. If 0.5 moles of A, 0.5 moles of B and 0.5 moles of C are placed in a 5 L solution, the reaction 1. shifts to the left. correct 2. is at equilibrium. 3.
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1178564859Xuj - Anderson Kiel Exam 2 Due Mar 8 2007 noon...

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