I wanted to calculate the hybridization of this molecule CHX3−CHX3. I noticed a shortcut formula given in my class notes for calculating the hybridization. It was
H=12×[V+M−C+A].
With
When I tried to calculate the hybridisation of CHX3−CHX3 by using above formula, where for any one of the carbon atom V=4, M=3, C=0, A=0 then H=72. But as we all know hybridization of every carbon in ethane is spX3, i.e. H should be 4. I know other methods of calculating H like H=no. of sigma bonds+ lone pairs, which gives me the right answer, but why does the above formula give something different? And also for any molecule if using that formula gives fractional answer then what does that mean?
