Question

An organic compound has following percentage composition c=12.36% H = 2.13% Br = 85% it's vapour density is 94.find it's molecular formula

Answer 1

hell.. ooo!!

vapor density = mass of n molecules of gas / mass of n molecules of hydrogen

Therefore:
vapor density = molar mass of gas / molar mass of H2
vapor density = molar mass of gas / 2.016

vapor density = ½ × molar mass

Molecular mass = 2xvd

therefore molecular mass is 188 so molecula formula will be C2H4Br2