Question

butyric acid contains carbon hydrogen and oxygen elements 4.24mg sample of butyric acid is completely burnt in oxygen it is 8.45mg co2 and 3.46 of water . what is the mean of each element determine emperical and molecular formula of butaric acid molecular mass in 88 unit.

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Answer 1

In CO2 the no of C atom is 1.

it means 44 mg of CO2  = 12 mg C

and 8.45 mg  = 12 X 8.45 / 44

                    =2.30mg

% of C = 2.30 X 100  / 4.24

           = 54.3 %

Similarly in H2O = 2H

               in 3.46mg of H2O H = 2 X 3.46 /18

                = 0.384mg

% of H = 0.348 x100 / 4.24  =9 %

 % of O = 100 - 63.3

 = 36.7%

By calculation we get the simple whole no ratio = 2:4:1

so empirical formula is C2H4O

and the value of n= 88 /44 =2

so molecular formula = c4 H8 O2

Answer 2

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