TABLE 6.1 BOND DISSOCIATION ENERGIES (atp) OF COMMON BONDS CH225 Workbook KJ/MOL
ID: 539807 • Letter: T
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TABLE 6.1 BOND DISSOCIATION ENERGIES (atp) OF COMMON BONDS CH225 Workbook KJ/MOL KCAL/MOL Bonds to H KVMOL KCAL/MOL K/MOL KCAL/MOL 435 435 410 385 92 (CHJ CH-F 444106 HO C-CH, 489117 (CH) CH-CI 335 80 CHs)CH-Br 285 68 104 H--CH3 H-CH-CH3 104 Bonds to methyl 435 104 (CHs)-CH-OH38 381 91 CH -F 473 113 CHy-Ci 456 109 351 84 293 70 H&C-C-x; 234 56 381 91 CH1 356 85 CH3-OH 3819 444 106 331 79 272 65 209 50 464 111 H3C-C-X 364 87 98 410 448 .339 569 136 CH,CHH (CHsyC-OH 381 91 107 CH,CH-F 431 103 368 88 297 498 119 435 104 X-X bonds F -F CHCHr-a 81: 159 242 58 192 46 151 36 213 51 .. 285 71 222 3 c H-OH CH CH2 OH 381 91 Br-Br H-OCH2CH HO-OH C-C bonds 368 CHyCH2 CH3 356 85 95 397 (CHa CH-CH 351 84 (CHJ)CH-H 351 84 Copyright 0 2012 John Wiley &Sons;, Inc. All rights reserved.Explanation / Answer
3)
CH3-CH2-CH2-CH3 + I-I (g)CH3-CH (I)-CH2-CH3 + H-I
The enthalpy change deals with breaking C-H bonds and I-I bonds and the formation of 1 mole of C-I bonds and H-I bonds.
The sum of the energies required to break the bonds on the reactants side is (C-H) 397 kJ/mol and (I-I) 151 kJ/mol= 548 kJ/moI
The sum of the energies released to form the bonds on the products side is C-I bonds = 222 kJ/mol and H-I bond = 297 kJ/mol
Therefore total released energy = 512 kJ/mol
Total energy difference is 548 kJ/mol – 512 kJ/mol = 36 kJ/mol, which indicates that the reaction is endothermic and that 36 kJ of heat is needed to carry out this reaction.
This reaction is endothermic since it requires energy in order to create bonds.
CH3-CH (F)-CH2-CH3 + H2O CH3-CH (OH)-CH2-CH3 + HF
The enthalpy change deals with breaking C-F bond and H-OH bond and the formation of 1 mole of C-OH bond and H-F bonds.
The sum of the energies required to break the bonds on the reactants side is (C-F) 444 kJ/mol and (H-OH) 498 kJ/mol= 942 kJ/moI
The sum of the energies released to form the bonds on the products side is C-OH bonds = 381 kJ/mol and H-F bond = 569 kJ/mol
Therefore released energy = 950 kJ/mol
Total energy difference is 950 kJ/mol – 942 kJ/mol = 8 kJ/mol, which indicates that the reaction is exothermic and that 8 kJ of heat is released during this reaction.
This reaction is exothermic since it releases energy in order to create bonds.
{ Here we select bond dissociation enthalpy of secondary carbon from the table }
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