Bond Dissociation Energy of 2Cl: 58 kcal/mole

In summary, the given reaction Cl2 = 58 kcal/mole ------> 2cl has a positive bond dissociation energy of 58 kcal/mole, meaning that it requires an input of heat to break the bond and form two Cl atoms. This reaction is endothermic, meaning that heat is absorbed by the system. The notation Cl_2 \longrightarrow 2 Cl \ \ \ \ \Delta H^0 = +58 \ kcal/mol is commonly used to represent this reaction.
  • #1
glycogen
2
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Given: Cl2 = 58 kcal/mole ------> 2cl

1. 58 kcal/mole is the bond dissociation energy T F

2. 58 kcal/mole is an entropy term T F

3. this reactin is endothermic T F

I don't understand get it! Any help woud be appreciated.
 
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  • #2
Did you mean to write [tex] Cl_2[/tex]+58 kcal/mole [tex]\rightarrow[/tex] 2 Cl?

If so, then think about what it means. What is happening when [tex]Cl_2 \rightarrow[/tex] 2 Cl?

What are you doing with the energy?

Can it be the 'entropy' term?
 
  • #3
Thats one notation. Most textbooks nowadays would say

[tex]Cl_2 \longrightarrow 2 Cl \ \ \ \ \Delta H^0 = +58 \ \ kcal/mol[/tex]

to avoid confusion about the "energy" change in the system. (At constant pressure, enthalpy = heat added or lost)

A positive enthalphy change corresponds with heat being absorbed by the system. A negative enthalpy change corresponds to heat being released by the system.
 
  • #4
Thanks for the explanations :). The formula makes sense now!
 

1. What is the definition of bond dissociation energy?

Bond dissociation energy is the amount of energy required to break a chemical bond and separate the atoms involved.

2. How is bond dissociation energy measured?

Bond dissociation energy is typically measured in units of kilocalories per mole (kcal/mol) using experimental techniques such as spectroscopy or calorimetry.

3. Why is the bond dissociation energy of 2Cl often reported as 58 kcal/mol?

The bond dissociation energy of 2Cl is often reported as 58 kcal/mol because it is the average of the bond dissociation energies for the two possible Cl-Cl bonds in the molecule. These bonds have different strengths and therefore different bond dissociation energies, but their average is often used for simplicity.

4. What factors can affect the bond dissociation energy of 2Cl?

The bond dissociation energy of 2Cl can be affected by factors such as the chemical environment, temperature, and the presence of other molecules or atoms that can interact with the Cl-Cl bond.

5. How is the bond dissociation energy of 2Cl used in chemistry?

The bond dissociation energy of 2Cl is an important parameter in chemical reactions and can be used to predict the stability of molecules and the products of chemical reactions. It is also used in calculations to determine the enthalpy change of a reaction.

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