... = 2808 - 3466 = -658 KJ/mol H is negative; therefore the reaction will be exothermic. * Ethanol Ethanol + Oxygen carbon dioxide + water C2H5OH + 3O2 2CO2 + 3H2O Sum of bond energies broken: 5(C-H) 5 x 413 = 2065 (C-O) 358 = 358 (O-H) 464 = 464 3(O=O) 3 x 498 = 1494 (C-C) 612 = 612 4993 KJ/mol Sum of bond energies formed: 4(O=C) 4 x 805 = 3220 6(H-O) 6 x 464 = 2784 + 6004 KJ/mol H = Sum of ßE broken - sum of ßE formed = 4993 - 6004 = -1011 KJ/mol H is negative; therefore the reaction will be exothermic * Propanol Propanol + oxygen carbon dioxide + water C3H7OH + 41/2O2 3CO2 + 4H2O Sum of bond energies broken: 7(H-C) 7 x 413 = 2891 (C-O) 358 = 358 (O-H) 464 = 464 41/2(O=O) 41/2 x 498 = 2241 2(C-C) 2 x 612 = 1224 + 7178 KJ/mol Sum of bond energies formed: 6(O=C) 6 x 805 = 4830 10(O-H) 8 x 464 = 3712 + 8542 KJ/mol H = Sum of ßE broken - sum of ßE formed = 7178 - 8542 = -1364 KJ/mol H is negative; therefore the reaction will be ...

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