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Q.

An organic compound having C,H and O has 13.13%H,52.14%C. Its molar mass is 46.068 g. What are its empirical and molecular formulae?

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a

C2H6O2,C3H9O4

b

C2H6O,C2H6O

c

CH3O,C2H6O2

d

C2H6O,C4H12O2

answer is C.

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Detailed Solution

Percentage composition =mass of elementtotal mass of compound×100

mass of carbon =52.14×46.06810024 g

=2 atoms of C.

max of Hydrogen =13.13×46.068100=6 g

=6 atoms of ' H "'

mass of oxygen =[100-(13.13+52.14)]×46.068100

16=1 atom of ' O '.

So, molecular formula =C2H6O

Since it cannot be further simplified, the empirical Formula is also the same.

Hence, option (C) is correct.

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