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Enthalpy

Chemistry 101 exam 2 key

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Chemistry 101 - Exam II Name ______________________ 26 October 2016 Show all work for credit. State any assumptions made to solve a problem. Give all numerical answers with the correct number of significant figures. All answers in scientific notation must be in correct scientific notation (i.e., 6.022?1023 not 6.022E23 or 6.022e23). All instances of incorrect scientific notation will result in the loss of 3 points each. All numbers that require units should have the units written. All instances of numbers without units will result in the loss of 3 points each. 1. (26 points) Cetane, C16H34, is a typical petrodiesel with a standard enthalpy of combustion of ?10 699.1 kJ mol?1. Methyl linoleate, C19H34O2, is a biodiesel with a standard enthalpy of

Enthalpy of formations chart for common substances

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Table of Heats of Formation Compound ?Hf (kJ/mol) Compound ?Hf (kJ/mol) AgBr(s) -99.5 C2H2(g) +226.7 AgCl(s) -127.0 C2H4(g) +52.3 AgI(s) -62.4 C2H6(g) -84.7 Ag2O(s) -30.6 C3H8(g) -103.8 Ag2S(s) -31.8 n-C4H10(g) -124.7 Al2O3(s) -1669.8 n-C5H12(l) -173.1 BaCl2(s) -860.1 C2H5OH(l) -277.6 BaCO3(s) -1218.8 CoO(s) -239.3 BaO(s) -558.1 Cr2O3(s) -1128.4 BaSO4(s) -1465.2 CuO(s) -155.2 CaCl2(s) -795.0 Cu2O(s) -166.7 CaCO3 -1207.0 CuS(s) -48.5 CaO(s) -635.5 CuSO4(s) -769.9 Ca(OH)2(s) -986.6 Fe2O3(s) -822.2 CaSO4(s) -1432.7 Fe3O4(s) -1120.9 CCl4(l) -139.5 HBr(g) -36.2 CH4(g) -74.8 HCl(g) -92.3 CHCl3(l) -131.8 HF(g) -268.6
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