Calculating Average C-H Bond Energy in Methane

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Discussion Overview

The discussion revolves around calculating the average C-H bond energy in methane, focusing on the theoretical and practical aspects of bond energy calculations, including the use of balanced equations and computational methods.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant notes that the average C-H bond energy in methane can be derived from the enthalpy of the reaction CH4(g) -> C(g) + 4H(g), suggesting it is 1/4 of this enthalpy.
  • Another participant expresses uncertainty about the appropriate equation to illustrate the average bond energy, acknowledging that the C-H bonds in methane are not identical and that the mean of these bond energies gives the average bond energy.
  • A different participant inquires whether it is possible to calculate the total bonding energy of a methane molecule using the total energies of CH4, C, and H obtained through DFT, asking for clarification on the method.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and approaches to calculating bond energy, with no consensus reached on the specific equations or methods to be used.

Contextual Notes

There are unresolved questions regarding the definitions and assumptions related to bond energies and the applicability of computational methods like DFT in this context.

Kushal
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Homework Statement



by means of a balanced equation, including state symbols, illustrate the term the average C-H bond energy in methane.



The Attempt at a Solution



i know what that all the C-H bonds in methane are not the same, and the mean of these bond energies give the average bond energy. but what equation i am supposed to write?
 
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Well the mean bond energy for methane is 1/4 the enthalpy for the reaction

CH4(g) -> C(g) + 4H(g)

I'm not sure if that helps you with your question.
 
yeah that makes sense!

thnks
 
hello ,
Can we calculate the total bonding energy of methane molecule if we know the total energies of ch4 , c and h (calculated using DFT)if yes then ho ?
thanks in advance
 
Last edited:

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