Question about Calculating Bond Energies

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    Bond Energies
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Discussion Overview

The discussion revolves around calculating bond energies in the molecule C2H6 (ethane) as part of a chemical equation. Participants are exploring the relevance of C-C bond energy in their calculations and how it relates to the overall change in enthalpy (ΔH).

Discussion Character

  • Homework-related, Technical explanation, Debate/contested

Main Points Raised

  • One participant states that they are given the bond energy for C-H bonds but questions the necessity of including C-C bond energy in their calculations.
  • Another participant suggests that if the elements are the same, then there may be no bond energy, referencing the concept of heat of formation.
  • A different participant asserts that the bond energy for C-C is definitely not zero and requests the full question to clarify whether the C-C bond can be ignored.
  • One participant reiterates that the C-C bond energy might cancel out in the calculations.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether the C-C bond energy should be included in the calculations, with some arguing it can be ignored while others assert it is significant.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about bond energies and the specific details of the chemical equation, which are not fully provided.

Lori

Homework Statement


Part of a chemical equation, but i had to calculate the bond energies in C2H6,

Homework Equations


im given that C-H bonds are 414 kj/mol[/B]

The Attempt at a Solution


and that i know there are 6 of these based on the lewis structure, but how come i don't have to include C-C bond energy? I wasnt given the bond energy for this. C2H6 was part of a chemical equation in which i had to calculate the bond energy for to find change in H[/B]
 
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Is it because if the elements are the same, then there is no bond energy? Cause i know that elements have 0 heat of formation
 
Definitely not zero. Can you show whole question, perhaps C-C bond can be somehow ignored?
 
Borek said:
Definitely not zero. Can you show whole question, perhaps C-C bond can be somehow ignored?
Hopefully you can see the question in the pic. It's question 16. Calculate change in H.
IMG1227841956.jpg
 

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Too small for details, but I still think C-C bond energy cancels out.
 

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