I have Benzene, Dewar Benzene, Prismane, and 1,3,5 cyclohexatriene (which looks just like benzene but with different lengths between the $\ce{C-C}$ bonds).

They are all $\ce{C_6H_6}$ chemical formula and I need to find out how many valence are in each molecule. I looked up what valence is but I'm confused if valence is the same thing as valence electrons or if valence is the amount of bonds the molecules can have. I think the amount of valence $\ce{H}$ can have is 1 but and $\ce{C}$ can have 4 so is the amount of valence 30?

i'm pretty sure the amount of valence electrons in all of them are 6.

  • $\begingroup$ What do you mean by " all of them "? $\endgroup$ – M.ghorab Jan 21 '16 at 17:53
  • $\begingroup$ @M.Ibrahim for benzene, dewar benzene, prismane, and 1,3,5-cyclohexatriene $\endgroup$ – Charlene Jan 21 '16 at 17:54
  • $\begingroup$ Which valence is equal to six ? carbons, hydrogens or both ? $\endgroup$ – M.ghorab Jan 21 '16 at 18:01
  • 1
    $\begingroup$ Why not ?, 24 carbon electron +6 hydrogen electrons =30 $\endgroup$ – M.ghorab Jan 21 '16 at 18:37
  • 3
    $\begingroup$ A molecule doesn't have a valence (usually spelled valency). Valency is a property of atoms. $\endgroup$ – bon Jan 21 '16 at 19:21

I assume that the answer is that they are all C6H6 compounds (sorry for the terrible image!):

C6H6 picture

As others have pointed out in the comments, it doesn't really make sense to talk about the valency of a molecule. You could say they all have the same elemental formula, but then so do around 200 other molecules (in theory).


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