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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