1A_2008_Spring_2_key - Chemistry 1A Spring 2008 Exam 2 Key...

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1 Chemistry 1A Spring 2008 Exam 2 Key Chapters 5, 6, and 7 (part) You might find the following useful. ΔΔ Δ H = E + ( n)RT R = 0.008314 kJ Km o l °° cal w 0.00418 kJ q = - C + m T K m o l ⎡⎤ Δ ⎢⎥ ⎣⎦ Δ H ° rxn = Σ Δ H f ° (products) Σ Δ H f ° (reactants) Heats of Formation for Some Common Inorganic Substances Substance State Δ H f ° kJ/mol Substance State Δ H f ° kJ/mol AgCl s 127.04 H 2 O 2 l 187.6 Al 2 O 3 s 1669.79 HI g 25.94 HBr g 36.23 MgO s 601.8 C(diamond) s 1.90 MgCO 3 s 1112.9 CO g 110.5 Mg(OH) 2 s 924.54 CO 2 g 393.5 NH 3 g 46.25 CaC 2 s 59.8 NO g 90.37 CaO s 635.55 NO 2 g 33.85 CaCO 3 s 1206.88 N 2 O 4 g 9.66 Ca(OH) 2 aq 1002.82 N 2 O g 81.56 CuO s 155.23 O 3 g 142.2 FeO s 272 S 8 (rhombic) s 0 Fe 2 O 3 s 824.2 S 8 (monoclinic) s 0.30 Fe 3 O 4 s 1118 SO 2 g 296.06 HCl g 92.31 SO 3 g 395.18 HF g 268.61 H 2 S g 20.15 H 2 O g 241.83 ZnO s 347.98 H 2 O l 285.8
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2 Heats of Formation for some Common Organic Substances Substance Formula State Δ H f ° kJ/mol Acetic acid HC 2 H 3 O 2 l 484.21 Acetaldehyde CH 3 CHO g 246.81 Acetone CH 3 COCH 3 l 246.81 Acetylene C 2 H 2 g 226.6 Benzene C 6 H 6 l 49.04 Ethane C 2 H 6 g 84.68 Ethylene C 2 H 4 g 52.3 Formic acid HCO 2 H l 409.20 Glucose C 6 H 12 O 6 s 1274.45 Methane CH 4 g 74.85 Methanol CH 3 OH l 238.66 Sucrose C 12 H 22 O 11 s 2221.70 Substance Density in g/mL battery acid 1.29 benzene, C 6 H 6 0.879 blood (whole) 1.05 bromine, Br 2 3.12 chocolate 1.75 copper, Cu 8.94 chromium(III) oxide, Cr 2 O 3 5.2 ethanol, C 2 H 5 OH(l) 0.7893 gasoline 0.7025 gold, Au 19.0 Iron, Fe 7.87 magnesium, Mg 1.74 nitrobenzene, C 6 H 5 NO 2 1.20 oleic acid 0.895 phosphorus oxychloride, POCl 3 1.675 sulfuric acid (concentrated) 1.84 water at 20 ° C 0.997
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3 For each of the following, write the word, words, letter, letters, or number in each blank that best completes each sentence. (2 points per blank) 1. Hydrated means bound to one or more water molecules. 2. A substance that ionizes or dissociates incompletely in an aqueous solution is a(n) weak electrolyte . 3. An acid that can donate two hydrogen ions per molecule in a reaction is a(n) diprotic acid .
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1A_2008_Spring_2_key - Chemistry 1A Spring 2008 Exam 2 Key...

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