heats of formation from bond energies! help please! thank you?

Question

Use Bond Energies in Table 3.3 of the print book or the Bond Energy Resource in the on-line textbook to estimate the heats of formation of the following gases:a) NF3b) H2N-NH2 c) F2C=CH2*d) CH3Cl* *Hint: Heats of formation have all reactants and products in their standard state. The standard state of carbon is solid graphite, whereas bond energies used in calculations are gas-phase energies. You can use the heat of formation of carbon gas to estimate the C-C bond energy in graphite. Bond energies in kJ/mol:C-H 413 N-H 391 O-H 463 H-H436 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 243C-Br 276 N-Br 243 O-Br 235 H-Br 366 Br-Br193C-I 234 O-I 234 H-I 299 I-I 151C-C 347 N-N 163 N-O 201 C-N293 C-O 358 O-O 146C=C 612 N=N 418 N=O 607 C=N 615 C=O799 O=O 495Ctriple bond 820 Ntriple bond 941 Ctriple bond891 Ctriple bond 1072

Dr. Reggie Bosco DVM · Accepted Answer

1. NF3: -1072. H2N-NH2: 863. F2C=CH2: -379.64. CH3Cl: -74.8

Dr. Reggie Bosco DVM · Answer

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.

Harmon Keeling

heats of formation from bond energies! help please! thank you?

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