Question

A compound possess 8% sulphur by mass. The least molecular mass is :

• A. 200
• B. 400
• C. 155
• D. 355

Answer 1

Answer: (B)

400

Answer 2

(2)

8% sulphur by mass means – 8 g sulphur is present in 100 g solid.

$\therefore$ 32 g sulphur (1 mole atom) will be present in

= $\frac{100}{8}$ × 32 = 400 g

[$\because$compound must be having at least one atom of sulphur]

$\Rightarrow$ min. mol. mass = 400 g.