CALCULEZ MOLI MAGNEZIU SI MOLI OXIGEN din numarul lui Avogadro
n=N/ Na= 12,046x10²³molec/6.023x10²³molec/mol= 2molMg
n= 30,115x10²³molec/6,023x10²³molec/mol= 5mol O2
din ecuatia
1mol.......0,5mol.......1mol
Mg + 1/2O2---> MgO
2mol.......x=1mol. ....y=2mol............> exces O2 -> 5-1=4mol
m,MgO= 2molx 40g/mol=.80g