Based on the bond energies for the reaction below, what is the enthalpy of the reaction, in kJ? H2(g) + N2(g) + 2 C(g) → 2 HCN(g) Single H C N Bond 432 C 411 346 386 305 167 459 358 201 142 C=C 602 C=0 799 C=C 835 C=0 1072 Multiple Bonds C=N 615 O=0 494 C=N 887 N=N 942 **All values in kJ/mol** I U Z O
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.
Based on the bond energies for the reaction below, what is the enthalpy of the reaction, in kJ? H₂(g) + N₂(g) + 2 C(g) → 2 HCN(g)
![Based on the bond energies for the reaction below, what is the enthalpy of the reaction, in kJ?
\[ \text{H}_2(g) + \text{N}_2(g) + 2 \text{C}(g) \rightarrow 2 \text{HCN}(g) \]
### Bond Energy Table
#### Single Bonds
- **H-H**: 432 kJ/mol
- **C-H**: 411 kJ/mol
- **C-C**: 346 kJ/mol
- **N-H**: 386 kJ/mol
- **C-N**: 305 kJ/mol
- **N-N**: 167 kJ/mol
- **O-H**: 459 kJ/mol
- **C-O**: 358 kJ/mol
- **N-O**: 201 kJ/mol
- **O-O**: 142 kJ/mol
#### Multiple Bonds
- **C=C**: 602 kJ/mol
- **C≡C**: 835 kJ/mol
- **C≡N**: 891 kJ/mol
- **N≡N**: 942 kJ/mol
- **C=O**: 799 kJ/mol
- **C≡O**: 1072 kJ/mol
- **O=O**: 494 kJ/mol
**Note**: All values are in kJ/mol.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9fb49495-af52-4a64-9bb0-12c821ce3caa%2F72dd1be9-313e-4179-b0b1-33cbe64329fa%2Fzrby281_processed.jpeg&w=3840&q=75)
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