How can the bond angle of a molecule be determined using its formula?

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Discussion Overview

The discussion centers on how to determine the bond angle of a molecule using its chemical formula. It explores theoretical frameworks, computational methods, and the influence of molecular structure on bond angles.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants suggest that simply knowing the number of atoms in a molecule is insufficient to determine bond angles, as angles are influenced by energy minimization.
  • Others propose that computational simulations can be used to find bond angles, alongside approximate rules for estimating angles based on atom combinations.
  • One participant emphasizes the importance of VSEPR theory and mentions factors such as lone pair repulsion that affect bond angles.
  • Another participant points out that structural isomers, such as propene and cyclopropane (C3H6), can have significantly different bond angles despite having the same molecular formula.

Areas of Agreement / Disagreement

Participants express differing views on the methods and factors that influence bond angles, indicating that multiple competing perspectives remain without a consensus.

Contextual Notes

Limitations include the dependence on molecular structure and the need for additional information beyond the molecular formula to accurately determine bond angles.

nicolauslamsiu
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How to determine the bond angle based on the formula of molecules?
 
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Just with the number of atoms, you can't do that. The angle will minimize the energy of the molecule. It is possible to simulate those molecules in a computer to find the angles, and there are approximate rules how to estimate the angles for various combinations of atoms.
 
Well many complex questions may be placed over this
the question becomes very diverse AND DIVERSE
firstly you must refer to vsepr theory
then facts like "lone pair lone pair" repulsion are more etc
adding to it someone mAY put forward the favorite exceptions like "drago's rule"
etc...
 
nicolauslamsiu said:
How to determine the bond angle based on the formula of molecules?

You need to know more than just an overall formula. Think structural isomers. For example C3H6 can be either propene or cyclopropane, and the bond angles between carbon atoms will be substantially different in each case.
 

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