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Unformatted text preview: McCord CH301 c = 3 . 00 × 10 8 m/s h = 6 . 626 × 10 − 34 J · s m e = 9 . 11 × 10 − 31 kg R = 3 . 29 × 10 15 s − 1 N A = 6 . 022 × 10 23 mol − 1 k = 1 . 381 × 10 − 23 J/K g = 9 . 81 m/s 2 d water = 1 . 00 g/mL 1 atm = 1 . 01325 × 10 5 Pa 1 lbs = 453.6 g 1 in = 2.54 cm E = hν c = λν λ = h p = h mv 1 2 mv 2 = hν Ψ ν = R parenleftbigg 1 n 2 1 1 n 2 2 parenrightbigg ψ n ( x ) = parenleftbigg 2 L parenrightbigg 1 2 sin parenleftBig nπx L parenrightBig E n = n 2 h 2 8 mL 2 n = 1 , 2 , 3 , ··· P = dhg PV = nRT P total = P A + P B + P C + ··· x A = P A /P total parenleftbigg P + a n 2 V 2 parenrightbigg ( V nb ) = nRT v rms = parenleftbigg 3 RT M parenrightbigg 1 / 2 rate of effusion ∝ radicalbigg T M Δ E = q + w H = E + PV Δ E = Δ H P Δ V Δ G = Δ H T Δ S Δ E = Δ H Δ nRT G = H TS Δ E = q v = nC v Δ T Δ H = q p = nC p Δ T w = P Δ V w = Δ nRT w = nRT ln V 2 V 1 q = + nRT ln V 2 V 1 Δ S = nR ln V 2 V 1 Δ S = q rev /T Δ S = nC v ln T 2 T 1 Δ S = nC p ln T 2 T 1 Δ H ◦ rxn = summationdisplay n Δ H ◦ f (prod) summationdisplay n Δ H ◦ f (react) Δ G ◦ rxn = summationdisplay n Δ G ◦ f (prod) summationdisplay n Δ G ◦ f (react) Δ S ◦ rxn = summationdisplay nS ◦ (prod) summationdisplay nS ◦ (react) S = k ln W Δ S trans = Δ H trans /T trans Version 112 – Final – McCord – (91750) 2 This printout should have 54 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points An endothermic reaction corresponds to one in which 1. change in energy is negative; heat is evolved. 2. change in energy is negative; heat is ab sorbed. 3. change in energy is positive; heat is evolved. 4. change in energy is positive; heat is ab sorbed. correct Explanation: Endothermic reactions require energy to flow from the surroundings into the system. In other words, heat is absorbed by the sys tem. Δ H , or the change in energy, is positive for endothermic reactions since the amount of energy in the system increased. 002 10.0 points The molecules in the reaction NH 3 (g) + 3 F 2 (g) → NF 3 (g) + 3 HF(g) contain only single bonds. What is the heat evolved or absorbed per mole of NH 3 that reacts? These bond energy values might be useful: HF 566 kJ/mol, FF 158 kJ/mol, NH 391 kJ/mol, NF 272 kJ/mol. 1. 566 kJ/mol 2. None of these 3. 867 kJ/mol correct 4. +151 kJ/mol 5. +1105 kJ/mol 6. +867 kJ/mol 7. 1105 kJ/mol 8.289 kJ/mol Explanation: 3(391)+3(158)3(272)3(566) = 867 003 10.0 points For the molecule ethylene (C 2 H 4 ) draw the Lewis dot structure. What are the number of sigma and pi bonds, respectively? 1. 5; 1 correct 2. 4; 2 3. 1; 1 4. 3; 1 5. 6; 0 Explanation: C H H C H H Ethylene contains four C H single bonds....
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This note was uploaded on 08/29/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Summer '07 term at University of Texas.
 Summer '07
 Fakhreddine/Lyon

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