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I had to do a lab for the first two I got delta H ( do...

I had to do a lab for the first two I got delta H ( do they seem right) but my main question is how do i know if the numbers are possible or negative (for 421.42 and 133.49)

Mg(s) + 2H+(aq)      -->     Mg2+(aq) + H2(g) 421.42

Mg2+(aq) + H2O (l)    -->   MgO(s) + 2H+ (aq) 133.49

½ O2(g) + H2(g)   -->         H2O(l) -285.5 kJ/mol (given this)

Mg(s) + ½ O2(g)   -->    MgO(s)

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