Răspuns:
MH2O=2×1+16=18g/mol
MMg(OH)2=24+2×16+2×1=58g/mol
58g 2×18g
Mg (OH) 2 + 2 HNO 2 → Mg (NO 2 ) 2 + 2 H 2 O
xg 25g
x=25×58/2×18=calculează
n=25/18=1,38moli H2O
2moli 2moli
Mg (OH) 2 + 2 HNO 2 → Mg (NO 2 ) 2 + 2 H 2 O
ymoli 1,38moli
y=1,38×2/2=calculează