What is the molecular formula of isomers? expanded structural formula? condensed structural formula? ^^,?

Answer 1

I give you an example :
we heve to write all isomers of C5H12
1) CH3CH2CH2CH2CH3 n-pentane
2 ) CH3 CH CH2CH3 2-methyl-butane
**********CH3

3 )°°°°°°CH3
°°°°CH3CCH3 2,2- dimethyl propane
°°°°°°°°°°CH3

So you have to use an expanded structural formula

Answer 2

They have identical molecular formulas except they are different substances.

Example Pentane and 1-Methyl-Butane
Both have the molecular formula of 5 parts Carbon and 12 parts Hydrogen--except they're different substances.

This is a condensed formual for pentane: CH3CH2CH2CH2CH3

This is an expanded version of pentane:

.....H....H....H....H...H.
H..C....C....C....C...C...H.
.....H....H....H....H...H

Answer 3

google it!

http://www.chemguide.co.uk/basicorg/isomerism/structural.html