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

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Determining bond angles in molecules requires more than just knowing the molecular formula; structural isomers play a crucial role. For instance, C3H6 can represent both propene and cyclopropane, each with distinct bond angles due to their different structures. VSEPR theory is essential for predicting these angles, as it accounts for electron pair repulsion, including the influence of lone pairs. Additionally, computational simulations can provide precise bond angles, while approximate rules exist for estimating angles based on atom combinations. The discussion also highlights the complexity of molecular geometry, including exceptions like Drago's rule, emphasizing that a thorough understanding of molecular structure is necessary for accurate bond angle determination.
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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