Question

a compound contains 92.31% carbon and 7.69% hydrogen. its molecular mass is 18u. Establish its empirical formula and molecular mass?

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11th

Chemistry

Organic Chemistry - Some Basic Principles and Techniques

Qualitative Analysis of Organic Compounds

A compound contains 92.3 | ...

Chemistry

A compound contains 92.3% carbon and 7.7% hydrogen. The molecule of the compound is 39 times heavier than hydrogen molecule. The molecular formula of the compound is:

Medium

Answer

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Correct option is

D

C

6

H

6

Let the Empirical formula be CH

x

.

So,

12+x

12

×100=92.3⟹x=1

Empirical formula =CH

Empirical formula weight =13

Molecular weight = 2×39=78

EW

MW

=

13

78

=6

Molecular formula=(Empirical formula)

6

Thus, the molecular formula of the compound is C

6

H

6

.