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  4. A metal nitride M3N2 contains 28% of nitrogen.The atomic mass of metal M is

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Q. A metal nitride $M_3N_2$ contains 28% of nitrogen.The atomic mass of metal M is

Some Basic Concepts of Chemistry

Solution:

Moles of $N =\frac{28}{14}=2$
Moles of metal, $M=\frac{100-28}{a}=\frac{72}{a}$
Mole ratio, $M:N=\frac{72}{a}:2=3:2$
$\frac{72}{a}=3$
$a=\frac{72}{a}=24$