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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.
For example, n-hexane, a chemical compound has the molecular formula CH3CH2CH2CH2CH2CH3, implying that it has a straight chain structure, 6 carbon atoms, and 14 hydrogen atoms. Hexane's molecular formula is C6H14, and its empirical formula would be C3H7 showing a C:H ratio of 3:7.As you have asked Benzene that is C6H6 Here the ratio of carbon and hydrogen is 1:1 And Acetylene that is C2H2 Here also the ratio is 1:1 Hence the empirical formula is the same but different masses.I hope you get it.oth have the same number of carbon (C) and hydrogen atoms (H). But benzene's formula is C6H6; acetylene is C2H2. A single molecule of benzene has exactly 3 times as many atoms as acetylene. So a mole of benzene will have 3 times the mass.