Question

the compound give the following data sequence 257 point 82% = 30 8.58 and the rest hydrogen .it vapour density is83.find the empirical and molecular formula.​

Answer 1

Answer:

Molecular formula = 2 x V.D. = 2 x 83 = 166

% of Hydrogen =100−(57.82+38.58)=3.6

Element             % Ratio                         Simplest Ratio            Empirical formula

Carbon             57.82/12=4.82                 4.82/2.41=2              C4H3O2

Hydrogen        3.6/1=3.6                        3.6/2.41=1.49

Oxygen            38.58/16=2.41                2.41/2.41=1

The empirical formula weight =12×4+3×1+16×2=83

Formula ratio =166/83=2

The molecular formula of compound =C8H6O4