Exam4 - 1A 8A 1 2 H He 1.008 2A 3A 4A 5A 6A 7A 4.003 3 4 5...

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Unformatted text preview: 1A 8A 1 2 H He 1.008 2A 3A 4A 5A 6A 7A 4.003 3 4 5 6 7 8 9 10 Li Be B C N O F Ne 6.94 9.01 10.81 12.01 14.01 16.00 19.00 20.18 11 12 13 14 15 16 17 18 Na Mg Al Si P S Cl Ar 22.99 24.30 3B 4B 5B 6B 7B 8B 1B 2B 26.98 28.09 30.97 32.06 35.45 39.95 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 39.10 40.08 44.96 47.90 50.94 52.00 54.94 55.85 58.93 58.71 63.55 65.41 69.72 72.64 74.92 78.96 79.90 83.80 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 85.5 87.6 88.9 91.2 92.9 95.9 98.9 101.1 102.9 106.4 107.9 112.4 114.8 118.7 121.7 127.6 126.9 131.3 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 132.9 137.3 138.9 178.5 180.9 183.9 186.2 190.2 192.2 195.1 197.0 200.6 204.4 207.2 209.0 210.0 210.0 222.0 87 88 89 104 105 106 107 108 109 110 Fr Ra Ac Rf Db Sg Bh Hs Mt Ds (223) (226) (227) (261) (262) (266) (262) (277) (268) ( ) 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140.1 141.0 144.2 145.0 150.3 152.0 157.2 158.9 162.5 164.9 167.3 168.9 173.0 175.0 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232.0 231.0 238.0 (237) (244) (243) (247) (247) (251) (252) (257) (258) (259) (260) g = 9 . 81 m/s 2 d water = 1 . 00 g/mL 1 atm = 1.01325 10 5 Pa N A = 6 . 022 10 23 mol- 1 k = 1 . 381 10- 23 J/K PLEASE NOTE: You will NOT have ac- cess to the Homework Service until 2 PM today (12/7/2005). At that time you will be able to access the solutions and see your scores. R = 0 . 08206 L atm/mol K R = 8 . 314 J/mol K R = 62 . 36 L torr/mol K 1 L atm = 101.325 J Water Data C s , ice = 2 . 09 J/g C C s , water = 4 . 184 J/g C C s , steam = 2 . 03 J/g C H fusion = 334 J/g H vapor = 2260 J/g Pickering, Tracey Exam 4 Due: Dec 7 2005, 3:00 pm Inst: McCord 2 This print-out should have 20 questions. Multiple-choice 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) 13 points The standard molar enthalpy of formation of NH 3 (g) is- 46 . 11 kJ/mol. What is the standard molar internal energy of formation of NH 3 (g)? 1.- 43 . 63 kJ/mol correct 2.- 51 . 07 kJ/mol 3.- 39 . 91 kJ/mol 4.- 48 . 59 kJ/mol 5.- 41 . 15 kJ/mol 6.- 46 . 11 kJ/mol 7.- 38 . 67 kJ/mol Explanation: H =- 46 . 11 kJ/mol T = 298 . 15 K (standard temperature) 1 2 N 2 (g) + 3 2 H 2 (g) NH 3 (g) n i = 1 2 + 3 2 mol = 2 mol n f = 1 mol n = (1- 2) mol =- 1 mol E = q + w, q = H and w =- P V =- n R T =- (- 1 mol)(8 . 31451 J / mol K) (298 . 15 K) kJ 1000 J = 2 . 47897 kJ...
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Exam4 - 1A 8A 1 2 H He 1.008 2A 3A 4A 5A 6A 7A 4.003 3 4 5...

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