Question

An organic compound on analysis was found to contain 0.032% of sulphur. The molecular mass of the compound, if its molecule contains two sulphur atoms is:

• A. 200
• B. 2000
• C. 20000
• D. 200000

Answer 1

The correct option is D 200000

Organic compound contains 0.032% of sulphur by mass.

Let the molecular mass of compound be '$X^{\prime }$.

Atomic mass of sulphur - $32g$

Atomic mass of 2 sulphur atoms = $32\times 2$ = $64gm$

weight of sulphur in compound = percentage of sulphur $\times$ total molecular weight of compound

$64gm$ = $0.032$% $\times X$ = $\frac{0.032}{100}\times X$

$X=\frac{64\times 100}{0.032}$ = $200000gm$

The molecular weight of the compound is 200000gm.

Hence,option D is correct answer.