Question

An organic compound contains 12.36% C,2.13% H, 85% Br. Its vapour density is 94. Find its molecular formula.

Answer 1

hell.. oooo!!!

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

i. e, vapor density = molar mass of gas / molar mass of H2

vapor density = molar mass of gas / 2.016

vapor density = ½ × molar mass

(and thus: molar mass = ~2 × vapour density)
therefore molecular mass is 188 so molecula formula will be C2H4Br2

hope this helps you...!!