có: Mhh khí= 32( g/ mol)
Áp dụng sơ đồ đường chéo có:
\(\frac{nN2}{nN2O}\)= \(\frac{12}{4}\)= 3
Mg\(\rightarrow\) Mg+2+ 2e
N+5+ 38e\(\rightarrow\) 3N2+ 2N+1
......0,11875.......0,025.... mol
\(\Rightarrow\) mmuối= 5,52+ 0,11875. 62= 12,8825( g)