Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
![Using average bond enthalpies (linked above), estimate the enthalpy change for the following reaction:
2C0(g) + 02(g) 2CO2(g)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F397ac19d-419d-47a7-b806-aa011335da74%2F03ec8d22-f12f-4044-9795-e8fbc8871aec%2Fpasffjs_processed.png&w=3840&q=75)
![Single Bonds
H C NO F Si P S Ci Br I
H 436 413 391 463 565 318 322 347 432 366 299
C 413 346 305 358 485
272 339 285 213
---
---
N 391 305 163 201 283
| 192 243
---
---
---
---
O 463 358 201 146 184 452 335 --- 218 201 201
F 565 485 283 184 155 565 490 284 253 249 278
Si 318
P 322
452 565 222
293 381 310 234
---
---
---
335 490
201
326
184
---
---
---
---
s 347 272
284 293
226 255 213
---
---
---
CI 432 339 192 218 253 381 326 255 242 216 208
|213 216 193 175
Br 366 285 243 201 249 310
I 299 213
---
201 278 234 184 --- 208 175 151
---
Multiple Bonds
Double
Triple Bonds
(kJ/mol)
Bonds
(kJ/mol)
C=C
602 C=C
835
O=0
498
C=0
732 C=O
1072
N=O
607
N=N
418 N=N
945
C=N
615 C=N
887](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F397ac19d-419d-47a7-b806-aa011335da74%2F03ec8d22-f12f-4044-9795-e8fbc8871aec%2Fx9zf393_processed.png&w=3840&q=75)
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