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alkane-CnH2n+2 alkene-CnH2n alkyl-CnH2n+1 aldehyde-R-CHO where R is any alkyl group ketone-R-CO-R where R is any alkyl group cycloalkane-CnH2n. svetlana Â· 5 years ago.
Hydrogen has valency of 1. the general formula for alkanes is CnH2n +2 (n means number of that atom.) so to find how many hydrogens there with, say, 50 carbons you would do CnH2n + 2= C50H102.ince propane has the formula C3H8, each mole of propane will have 8 moles of hydrogen atoms, so 5 moles of propane will contain 5x8=40 moles of hydrogen.