Estimate the enthalpy change for the following reaction: Н,с-Br + H,S H,C-SH + HBr Average Bond Enthalpies KJ/mol KJ/mol 391 Bond C=C CEC KJ/mol KJ/mol 463 Bond KJ/mol Bond Bond N-H Bond 413 O-H 0-0 С-Н F-F 155 253 614 С-С 348 N-N 163 146 CI-F 839 615 891 799 C-N 293 N-O 201 О-F 190 CI-CI 242 C=N CEN O-CI C-O С-F C-CI 237 218 193 358 N-F N-CI 272 203 Br-F Br-CI 485 328 200 243 O-I 234 C=O C=O N-Br Br-Br C-Br 276 S-H 339 1072 C-I 240 Н-Н 436 S-F 327 1-CI 208 C-S 259 S-CI H-F H-CI Н-Br 567 253 218 266 I-Br 175 151 N=N 418 431 S-Br NEN N=O 941 366 299 389 536 Si-H 323 S-S Si-Si 226 H-I 607 Si-C 301 Si-O 368 Si-CI 464 В-Н Р-Н 322 B-O В-F B-CI 613 456 S=O S=S 523 418 В-Br 377 O2 495
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.
Estimating enthalpy change?? Thank you so much!
![### Estimation of Enthalpy Change for a Reaction
**Reaction Given:**
\[ \text{H}_3\text{C-Br} + \text{H}_2\text{S} \rightarrow \text{H}_3\text{C-SH} + \text{HBr} \]
**Average Bond Enthalpies (in kJ/mol):**
**Common Bonds:**
- C-H: 413
- C-C: 348
- C-N: 293
- C-O: 358
- C-F: 485
- **C-Br**: 276
- C-I: 240
- **C-S**: 259
**Additional Bonds:**
- C-Cl: 328
- N-H: 391
- N-N: 163
- N-O: 201
- N-F: 272
- **N-Cl**: 200
- **N-Br**: 243
- O-H: 463
**Halogen Bonds:**
- O-O: 146
- O-F: 190
- O-Cl: 203
- **O-I**: 234
**Hydrogen and Other Bonds:**
- **H-H**: 436
- H-F: 567
- **H-Cl**: 431
- **H-Br**: 366
- **H-I**: 299
**Sulfur Bonds:**
- **S-H**: 339
- S-F: 327
- **S-Cl**: 253
- S-Br: 218
- **S-S**: 266
**Phosphorus and Boron Bonds:**
- **P-H**: 322
- B-H: 389
- B-O: 536
- **B-F**: 613
- B-Cl: 456
- B-Br: 377
**Dihalogen and Multiple Bonds:**
- **F-F**: 155
- **Cl-F**: 253
- **Cl-Cl**: 242
- **Br-F**: 237
- **Br-Cl**: 218
- **Br-Br**: 193
- **I-Cl**: 208
- **I-Br**: 175
- **I-I**: 151
**Multiple Bonds:**
- **C=C**](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff5d66ebf-e981-4b57-99d2-f171bcd6f6b7%2Fc7d17226-581c-4201-a61f-a7a5e01c5c0d%2Fso296w8_processed.png&w=3840&q=75)
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