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An alkane has a molecular mass of 86.What is the molecular formula of the alkane? Write all the possible isomers for this molecular formula?

An alkane has a molecular mass of 86.What is the molecular formula of the alkane? Write all the possible isomers for this molecular formula?

Grade:12

6 Answers

pooja
18 Points
10 years ago

let the formula of the alkane be CnH2n+2

Therefore  we have 

12n + 1(2n+2) = 86

12n +2n+2=86

14n = 84

n=6

i.e the formula of the given alkane is C6H14 !

following are its possible isomers :

  1. n-hexane
  2. 2-methyl pentane
  3. 3-methyl pentane
  4. 2,2 dimethyl butane
king
39 Points
10 years ago

. The general formula of alkane is CnH2n+2.
Its molecular mass would be = 12 (n) + 1 (2n + 2) = 14n + 2
Given molecular mass = 86
14n + 2 = 86
?
n=6
? Molecular formula of the alkane is C6H14.


The possible isomers for this molecular formula are:


1. CH3 – CH2– CH2–CH2 – CH2 – CH3


2.
CH3 – CH2 – CH2 – CH – CH3
CH3
2 - Methylpentane


3.
CH3 – CH2 – CH – CH2 – CH3
CH3
3 - Methylpentane


CH3
4.
CH3 – CH2 – C – CH3
CH3
2,2 - Dimethylbutane


5.
CH3 – CH – CH – CH3
CH3
CH3
2,3 - Dimethylbutane

Thus, five isomers are possible for C6H14

king
39 Points
10 years ago

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ruchi yadav
askIITians Faculty 27 Points
10 years ago
Let the molecular formula for given alkane is CnH2n+2
so, Given that 12*n+ 1*(2n+2) = 86
n = 6

So alkane will be C6H14

and possible isomers are Hexane and 2-methylpentane.

Thank You
Ruchi
Askiitians Faculty

ruchi yadav
askIITians Faculty 27 Points
10 years ago 
Let the molecular formula for given alkane isCnH2n+2
so, Given that 12*n+ 1*(2n+2) = 86
n = 6

So alkane will be C6H14

and possible isomers are Hexane and 2-methylpentane.

Thank You
Ruchi
Askiitians Faculty
ankit singh
askIITians Faculty 614 Points
3 years ago
 
let the formula of the alkane be CnH2n+2
Therefore we have
12n + 1(2n+2) = 86
12n +2n+2=86
14n = 84
n=6
i.e the formula of the given alkane is C6H14 !
following are its possible isomers :
n-hexane
2-methyl pentane
3-methyl pentane
2,2 dimethyl butane
 

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