Question

a compound contains 28% nitrogen and 72% metal by mass. 3 atom of the metal combine with 2 atoms of nitrogen. the atomic mass of the metal is

Answer 1

Let the mass of compound is 100 g. Consider the metal is represented as "M".
Mass of Nitrogen = 28 g
Mass of Metal = 72 g
3 atoms of Metal combine with 2 atoms of Nitrogen. Molecular formula of compound is M₃N₂.
Molar mass of Compound = 100 g
Consider the atomic mass of metal is "x" u.
.Atomic mass of Nitrogen = 14 u
3x + (2$\times$14) = 100
3x = 100 - 28
3x = 72
x = 72 / 3
= 24 g
Atomic mass of Metal is 24 u.