Răspuns:
n=nr.moli ; n=m:M ; m=masa subst. ; M=masa molara
Explicație:
MMgO=24 +16=40---->40g/moli
n= 160g : 40g/moli=4 moli MgO
mg xg 160g
2Mg + O2=2MgO
2.24g 32g 2.40g
m=48. 160 : 80=96g Mg
n= 96g :24g/moli=4moli Mg
x=32 . 160 :80=64 g oxigen
n=64g : 32g/moli=2 moli O2