atentie ,daca 8% sunt impuritati ,puritatea este 92%
m,pur= 52,176x92/100= 48gMg pur
n(niu)= m/A---> n=48g/24g/mol=2mol
Mg+ 1/2O2--> MgO
MgO+ H2O---> Mg(OH)2
1molMg.....1mol MgO.......1molMg(OH)2
2mol...................................2mol
m= 2molxM,Mg(OH)2.................calculeaza !!!!