Formula masses and percent composition
of three theoretical compounds of Mg and O
Formula of Oxide
Mg
x
O
y
%Mg
%O
MgO
60.3%
39.7%
MgO
2
43.2%
56.8%
Mg
2
O
75.2%
24.8%
Mg = 60.3%
and
O = 39.7%