heats of formation from bond energies! help please! thank you?
I need assistance estimating the heats of formation for the following gases using the bond energies provided in Table 3.3 of the print book or the Bond Energy Resource in the online textbook:
a) NF3
b) H2N-NH2
c) F2C=CH2
d) CH3Cl
Please note that heats of formation are calculated with all reactants and products in their standard state. The standard state of carbon is solid graphite, while the bond energies used in these calculations are for gas-phase energies. You can use the heat of formation of carbon gas to estimate the C-C bond energy in graphite.
Here are the bond energies in kJ/mol:
C-H: 413
N-H: 391
O-H: 463
H-H: 436
C-F: 485
N-F: 272
O-F: 190
H-F: 565
F-F: 159
C-Cl: 328
N-Cl: 200
O-Cl: 203
H-Cl: 431
Cl-Cl: 243
C-Br: 276
N-Br: 243
O-Br: 235
H-Br: 366
Br-Br: 193
C-I: 234
O-I: 234
H-I: 299
I-I: 151
C-C: 347
N-N: 163
N-O: 201
C-N: 293
C-O: 358
O-O: 146
C=C: 612
N=N: 418
N=O: 607
C=N: 615
C=O: 799
O=O: 495
C (triple bond): 820
N (triple bond): 941
C (triple bond): 891
C (triple bond): 1072
Thank you for your help!
2 Answers
Feb 12, 2025
ok, first, you would be wanting to function skill to interrupt the bonds indoors the reactants (use the smart fee of the bond energies). next you would be wanting to launch skill to sort the products (it extremely is why bonds ensue, to chop back the atoms’ in a molecule skill.) So somewhat, it extremely is the sum of the reactant bond energies minus the sum of the product bond energies. as quickly as you attempt this, you would be wanting to get: 2381 kj/mol – 2711 kj/mol = -330 kj/mol additionally, you would be wanting to be waiting to charm to the Lewis shape for the molecules so as which you will see that which atoms bond to which atoms.
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