Răspuns:
-calculez masa de Mg pur
p=m,purx100/m,inpur----> m,p= 8x80/100g= 6,4gMg pur
A,Mg= 24g/mol
M,MgO= (24+16)g/mol= 40g/mol
-din ecuatai chimica , deduc masa de oxid de magneziu
2x24g........................2x40g
2Mg + O2-----> 2MgO
6,4g.............................x
x=m=6,4x40/24g=10,66gMgO
sper ca team ajutat! :)
Explicație:
