Use the bond energies provided to estimate AH°rxn for the reaction below. PCI3(g) + Cl2(g) → PCI5(1) AH°rxn = ? Bond Bond Energy_(kJ/mol). CI-CI 243 P-CI 331
Types of Chemical Bonds
The attractive force which has the ability of holding various constituent elements like atoms, ions, molecules, etc. together in different chemical species is termed as a chemical bond. Chemical compounds are dependent on the strength of chemical bonds between its constituents. Stronger the chemical bond, more will be the stability in the chemical compounds. Hence, it can be said that bonding defines the stability of chemical compounds.
Polarizability In Organic Chemistry
Polarizability refers to the ability of an atom/molecule to distort the electron cloud of neighboring species towards itself and the process of distortion of electron cloud is known as polarization.
Coordinate Covalent Bonds
A coordinate covalent bond is also known as a dative bond, which is a type of covalent bond. It is formed between two atoms, where the two electrons required to form the bond come from the same atom resulting in a semi-polar bond. The study of coordinate covalent bond or dative bond is important to know about the special type of bonding that leads to different properties. Since covalent compounds are non-polar whereas coordinate bonds results always in polar compounds due to charge separation.
![**Estimating Reaction Enthalpy Using Bond Energies**
To estimate the change in enthalpy (\( \Delta H^\circ_{\text{rxn}} \)) for the reaction:
\[ \text{PCl}_3(g) + \text{Cl}_2(g) \rightarrow \text{PCl}_5(l) \]
we use the bond energies provided.
**Given Bond Energies:**
- **Cl-Cl bond energy:** 243 kJ/mol
- **P-Cl bond energy:** 331 kJ/mol
**Explanation:**
The table below lists the bond energies for specific chemical bonds:
| Bond | Bond Energy (kJ/mol) |
|---------|----------------------|
| Cl-Cl | 243 |
| P-Cl | 331 |
*Note: To calculate \( \Delta H^\circ_{\text{rxn}} \), consider the bonds broken and formed in the reaction:
1. **Bonds Broken:**
- 1 Cl-Cl bond in \( \text{Cl}_2(g) \)
2. **Bonds Formed:**
- 2 P-Cl bonds in \( \text{PCl}_3(g) \)
- 3 new P-Cl bonds in \( \text{PCl}_5(l) \), resulting in a total of 5 P-Cl bonds
Thus, the net change in bond energy will determine the enthalpy change for this reaction.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F85921574-93fe-435f-87fd-c0b036c84801%2Fe257fce4-1117-46b8-8946-2cb3f7ab1304%2Fx7psfos_processed.png&w=3840&q=75)
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