Bond Dissociation Energy of 2Cl: 58 kcal/mole

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Discussion Overview

The discussion revolves around the bond dissociation energy of chlorine gas (Cl2) and its implications in a chemical reaction. Participants explore the meaning of the bond dissociation energy, its classification as an enthalpy term, and the nature of the reaction (endothermic or exothermic).

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant states that the bond dissociation energy of Cl2 is 58 kcal/mole and poses questions regarding its classification as an enthalpy term and the nature of the reaction.
  • Another participant suggests a notation for the reaction that clarifies the energy change involved when Cl2 dissociates into 2 Cl atoms.
  • A later reply emphasizes the importance of understanding enthalpy changes, noting that a positive enthalpy change indicates heat absorption by the system.
  • One participant expresses gratitude for the explanations, indicating improved understanding of the formula.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the classification of the bond dissociation energy as an entropy term, and the nature of the reaction remains a point of exploration rather than resolution.

Contextual Notes

There is some ambiguity regarding the definitions and implications of bond dissociation energy and enthalpy changes, which may depend on the context of the discussion.

Who May Find This Useful

Individuals interested in chemistry, particularly those studying thermodynamics and reaction energetics, may find this discussion relevant.

glycogen
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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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Did you mean to write Cl_2+58 kcal/mole \rightarrow 2 Cl?

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

What are you doing with the energy?

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

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

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.
 
Thanks for the explanations :). The formula makes sense now!
 

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