Question

Distinguish between the following pairs of compounds using the test given within the bracket A compound contains 92.3 % carbon and rest hydrogen. Its molecular mass is 78. Calculate its molecular formula. (C=12, H = 1)​

Answer 1

Explanation:

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

.