The molecular mass of a hydrocarbon is 86 g/ | vedclass

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(B) The general formula for an alkane is $C_nH_{2n+2}$.Given molecular mass = $86 \ g/mol$.$12n + 1(2n+2) = 86$$14n + 2 = 86$$14n = 84$$n = 6$.The hyd

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$5$

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(B) The general formula for an alkane is $C_nH_{2n+2}$.Given molecular mass = $86 \ g/mol$.$12n + 1(2n+2) = 86$$14n + 2 = 86$$14n = 84$$n = 6$.The hydrocarbon is hexane $(C_6H_{14})$.The structural isomers of hexane are:$1$. $n$-hexane $(CH_3-CH_2-CH_2-CH_2-CH_2-CH_3)$$2$. $2$-methylpentane $(CH_3-CH(CH_3)-CH_2-CH_2-CH_3)$$3$. $3$-methylpentane $(CH_3-CH_2-CH(CH_3)-CH_2-CH_3)$$4$. $2,2$-dimethylbutane $(CH_3-C(CH_3)_2-CH_2-CH_3)$$5$. $2,3$-dimethylbutane $(CH_3-CH(CH_3)-CH(CH_3)-CH_3)$Total number of structural isomers = $5$.

The molecular mass of a hydrocarbon is $86 \ g/mol$. What is the number of its possible structural isomers?

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