Answer to Question #231487 in General Chemistry for Naz

General Chemistry

Question #231487

Calculate the enthalpy of the following reaction:

2Mg + O2 > 2MgO

Given:

Mg + 2HCl > MgCl2 + H2. H=-21.0 kJ

MgO + 2HCl > MgCl2 + H2O. H=-33.5 kJ

H2 + 1/2 O2 > H2O. H=-76.0 kJ

Expert's answer

Enthalpy=(-21)2+(33.5)2-76

-42+67-96

-42-9=-51

=-51kJ

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