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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. Δ Δ Δ H = E + ( n)RT R = 0.008314 kJ K mol ° ° cal w 0.00418 kJ q = - C + m T K mol 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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