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any alkane consists of a string of carbon molecules with covalent SINGLE bonds between adjacent carbon atoms. The carbon atoms are then single bonded to two hydrogen atoms each, and the carbon atoms on the end of the chain that are only bonded to one other carbon atom each get 3 hydrogens. so an alkane with 2 carbons gets 6 hydrogen, an alkane with 3 carbons gets 8, an alkane with 4 carbons gets 10, etc.

So the formula is CnH2n+2. This means if you have 'n' carbon atoms in the alkane, you have 2n+2 hydrogen atoms.

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