A compound contains 28% of nitrogen and 72% of a metal by weight. 3 atoms of the metal combine with 2 atoms of nitrogen. Find the atomic weight of the metal.

Explanation

Formula of metal nitride would be `M_(3) N_(2)`
Let atomic mass of metal be ‘m’ gm/mol.
% by mass of nitrogen in metal nitride `= (28)/(3m + 28) xx 100 = 28` (Given)
`rArr 3m = (72)/(3) = 24 gm//mol`