Question

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

Answer 1

Always make the table shown in attachment ,then you would never get this type of question wrong
See attachment.....

Answer 2

Explanation:

Then after getting the molecular mass we will apply the formula n = Molecular Weight / Emperical Weight i. e. 188/94 = 2

Now , Molecular Formula = CH2 Br × 2

= C2H4Br2