Question

A compound contains $28$% nitrogen and $72$% metal by weight. Three atoms of metal combine with two atoms of nitrogen. The atomic weight of the metal is:

• A. $12$
• B. $24$
• C. $36$
• D. $48$

Answer 1

Answer: (B)

$24$

Let us take the mass of compound = 100 gm

$100$ g of a compound contains $28$ g of nitrogen and $72$ g of metal.

Weight of two $N$ atoms $=28$ g

Weight of three metal atoms $=72$ g

$\therefore$ Weight of one metal atom $=\frac{72}{3}=24$ g.

Hence, option B is correct.