What would be the three equations that cancel correctly for


What would be the three equations that cancel correctly for Hess Law for the following reaction for Magnesium oxide that you would have Mg(s) + 1/2 O2(g) = MgO(s) ? Would the change in heat be a negative or a positive? what would be the final net reaction? I am confused would you then have four equations

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Chemistry: What would be the three equations that cancel correctly for
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