What is the percent composition of magnesium (mg) in mgo?

MgO-magnesium oxide
M₁₂=40 g/mole magnesium oxide
M₁=24 g/mole magnesium
M₂=16 g/mole oxygen
     ↓
in  40 g MgO24 g Mg16 G
in 100 g MgOx g Mg
     ↓
x=100·24/40
x=60 % Mg  from  MgO

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