Question

Mg + O2 = MgO And not MgO2, Why?
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Answer 1

Answer:

because of valancy

1. Valancy of Mg is 2 and
2. Valancy of O is also 2

so this is MgO

not MgO2

Answer 2

Answer:

According to law of conservation of mass, MgO2 will not be formed because in that case the mass of reactants will not be equal to the mass of products, and moreover the reaction would not be balanced.

Explanation:

2Mg+O2=2MgO

This is a balanced equation.

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