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In this case they are n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane. Any formula that goes by CnH2n+2 is an alkane. There isn't a formula you can use to find out how many isomers there are for any given class of molecules with a specified number of carbons. You just have to think very systematically when you try to find them all.
Isomers. Pentane is one of three structural isomers with the molecular formula C5H12, the others being isopentane and neopentane.The branched isomers are more stable than pentane, which means that they have lower heat of formation and heat of combustion.sopentane is more stable than pentane by 1.8 kcal/mol, and neopentane by 5 kcal/mol. A related cycloalkane is cyclopentane, although this is not an isomer of pentane as its molecular formula is different, cyclopentane is an isomer of the pentenes.