Question

A certain organic substance used as a solvent in
many reactions contains carbon, hydrogen, oxygen
and sulphur. Weight % of hydrogen in the
compound is 7.7. The weight ratio C:0:S= 3:2
: 4. What is the least possible molar mass of the
compound?
(A) 86
(B) 63
(C) 94
(D) 78​

Answer 1

Answer:

Let us suppose that the mass of the compound is 100 g

Mass % of H=7.7

Mass % of C=30.74

Mass % of O=20.52

Mass % of S=41.04

least possible molar mass of the compound is the empirical molar mass

empirical formula=C

2

H

6

OS

=2(c)+6(H)+(O)+S=24+6+16+32=78 g