Use the molar bond enthalpy data in the table to estimate the value of AHxn for the equation C,H,(g) + HBr(g) → C,H,Br(g) The bonding in the molecules is shown. H. H Br C: + H-Br H-Ć- -C-H H' H.
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.
![Use the molar bond enthalpy data in the table to estimate the value of ΔH°<sub>rxn</sub> for the equation
\[ \text{C}_2\text{H}_4(\text{g}) + \text{HBr}(\text{g}) \rightarrow \text{C}_2\text{H}_5\text{Br}(\text{g}) \]
The bonding in the molecules is shown.
**Diagram Explanation:**
- **Reactants:**
- Ethylene (C₂H₄) is shown with a carbon-carbon double bond. Each carbon is bonded to two hydrogen atoms.
- Hydrogen bromide (HBr) is shown with a single bond between hydrogen and bromine.
- **Products:**
- Ethyl bromide (C₂H₅Br) is shown with a carbon-carbon single bond. The first carbon is bonded to three hydrogens, and the second carbon is bonded to two hydrogens and one bromine.
The reaction involves breaking the C=C double bond in ethylene and the H–Br bond, and forming new C–C, C–H, and C–Br bonds in ethyl bromide. Use the given bond enthalpy values to calculate the reaction enthalpy change.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F28113ec2-37ac-45d1-a0e9-7ed3588453b7%2F94bf76bb-c07c-469c-ad9a-b93173219c2b%2Fe0d1o2e_processed.png&w=3840&q=75)

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