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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?

kiran kumar , 11 Years ago
Grade 12
anser 6 Answers
pooja

Last Activity: 11 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

Last Activity: 11 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

Last Activity: 11 Years ago

568_96515_answer.jpg

ruchi yadav

Last Activity: 11 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

Last Activity: 11 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

Last Activity: 4 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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