A compound contains 8% sulphur. The minimum molecular weight of the compound is

Options

A. 100
B. 200
C. 350
D. 400

Answer

D

Explanation

Let .a. atoms of sulphur be present in the compound and y be the weight of the compound
8% of weight of compound = weight of sulphur in compound
`8/100 y = 32 xx a`
` y = 3200/8 a = 400 a .
The minimum molecular weight is the one in which a = 1 (i.e 1 atom of sulphur is present)