Răspuns:
Explicație:
xg 160g
2Mg + O2= 2MgO
2 .24g 2.40g
x=2 .24 .160 : 2 .40=96 g Mg
n=nr. moli
n=m:M
n=96g : 24g/moli=4moli Mg
n=160g : 40g/moli=4 mol MgO
160g yg
MgO + H2O= Mg(OH)2
40g 58g
y=160 . 58 : 40=232 g Mg(OH )2
n= 232g : 58g/moli=4moli Mg(OH)2
MMgO=24 +16=40.------>40g/moli
MMg(OH)2=24 +2.16 +2=58------>58g/moli