Răspuns:
MMg=24g/mol
MMgO=24+16=40g/mol
2x24g................2x40g
2Mg + O2 → 2MgO
240g......................xg
x=240x2x40/2x24=400g MgO
calculam numarul de moli
n-m/M=240/24=10moli Mg
2moli...................2moli
2Mg + O2 → 2MgO
10moli................y moli
y=10x2/2=10moli MgO
Explicație:
