Calculate the heat of formation of Magnesium oxide (MgO). Data given are: Mg(s)

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Mg(s) + 1/2O2(g) --> MgO(s) ?H given: 1] Mg(s)+ 2HCl(aq) --> MgCl2(aq)+ H2(g) ?H = 135.75 kJ/mole 2] MgO(s) + 2HCl(aq) --> MgCl2 (aq)+ H2O(l) ?H = 91.34 kJ/mole 3] H2(g) + 1/2 O2(g) --> H2O(l) ?H = 285.8 kJ/mole reverse 2] MgCl2(aq) + H2O(l) --> 2HCl(aq) + MgO(s) ?H = -91.34 kJ add 1] Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) ?H = 135.75 kJ Mg(s) + H2O(l) --> H2(g) + MgO(s) ?H = 44.41 kJ add 3] Mg(s) + 1/2O2(g) --> MgO(s) ?H = 330.21 kJ/mole

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