1. The problem statement, all variables and given/known data Calculate Delta G Degree for 2Mg(s) + O2(g) -> 2MgO(s) 2. Relevant equations Delta G = (Delta G of products - Delta G of reactants) 3. The attempt at a solution So according to my book's appendix, the dG of Mg is 0, the dG of O2 is 0, and the dG of MgO is -596.6. So I figured the equation would be: (2*-596.6) - 0, and that was incorrect. Where am I going wrong?