A compound contains 28g of nitrogn and 72% of metal by weight. In the compound, 3 atoms of metal remains combined with 2 atoms of nitrogen. What is the atomic mass 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`