A compound contains 28% N and 72% of a metal by weight . Three atoms of metal combine with two atoms of N . Find the atomic weight of metal.

Options

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

Answer

B

Explanation

`MW = 28 +72 = 100`
Wt. of two 'N' atoms `= 28gm`
Wt. of 3 metal atoms `= 72 gm`
Wt. of 1 metal atoms `= ?`
`= (72)/(3) = 24`