The chlorination of ethane gives a compound with the percent composition by mass of chlorine in the compound is 71.7%

A) find the molecular formula of this compound
B) write the condensed structural formulas of the isomers of this compound and give their names
C) one of the isomers formed during the chlorination of ethane is a major product. Which one, and why?

(I mainly need an answer to a and b)

THANK YOU

2 answers

Part c
C2H6 is ethane after chlorination n atoms of hydrogen is replaced by n atoms of chlorine so molecular formula becomes C2H6-nCln
Molar mass=12×2+6-n+35.5×n
=30+34. 5n
%=molar massof Cl÷molarmass of compound×100
%=(35.5n÷(30+34.5n))×100=71.7
n=2
C2H4Cl2 is molecular formula