Is there a general molecular formula for polyhydric alcohols? Does it also exist for polyhydric alcohols? For alkanols, for example, it is CnH2n+2O.
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Not really. Depending on the chain length, you can have different many OH groups. Thus, for example, in a pentane basic structure between one and five OH groups.
But for them, the sum formula can be considered quite simply because in principle you only insert an O between a C-H binding. For example, in a trivalent pentaol, you would have to add the sum formula of the pentane C5H12 only by these three O, i.e. C5H12O3.