Răspuns:
A,Mg=24g/mol
A,O=16g/mol ; miuO2=32g/mol
miu,MgO= 40g/mol
m,MgO=800g
niu=m/miu= 800/40mol=20mol MgO
2mol.......1mol.....2mol
2Mg + O2----> 2MgO
x................y............20mol
x=20molMg
y=10molO2
m,Mg=niuxA=20X24g=
m,O2=niuxmiu=10x32g=
finalizeaza calculele!!!!!!!
Explicație: