The compound oxygen difluoride is quite reactive, giving oxygen and HF when treated with water: OF (g) + H20(g)→02(g) + 2HF(g) AE =-318KJ Ixn Using bond energies, calculate the bond dissociation energy of the O-F bond in OF2.
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
Polarity Of Water
In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
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The compound oxygen difluoride is quite reactive, giving oxygen and HF when treated with water:
OF2(g) + H20(g)→ 0g) + 2HF(g)
=-318 kJ
ot
Using bond energies, calculate the bond dissociation energy of the O-F bond in OF7.
Average Bond Energies (kJ/mol)
Single Bonds
Multiple Bonds
pt
N-H
391
149
C=C
614
432
565
H-H
839
495
745
1072
607
418
941
pt
H--F
N-N
160
208
C=C
N-F
272
|-Br
175
H-CI
H-Br
427
363
295
N-CI
N-Br
C=0*
C=D0
200
pt
H-1
243
S-H
347
N-O
201
S-F
327
N=N
N N
253
S-CI
S-Br
467
413
347
305
358
C-H
146
218
C--C
C--N
C-O
C--F
C-CI
C-Br
O-O
891
C=N
C-N
S-S
266
190
203
O-F
615
0-CI
340
393
360
452
485
O-I
一
234
Si-Si
339
276
Si-H
Si-C
Si-O
e F-F
154
253
240
259
F-CI
F-Br
Cl-CI
C-S
237
239
218
193
Cl--Br
Br--Br
*C==
O(in CO,) - 799
O-F bond dissociation energy:
kJ mol
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