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If we are given a chemical reaction formula and have the DeltaG values similar to that of the midterm, then we would use products minus reactants. However, if given entropy or enthalpy, I believe we would be prompted to use the DeltaG = DeltaH - TDeltaS.
similar to the midterm problem when given the values for delta g you can you use the products minus reactants equation but when given values for enthalpy and entropy you should be prompted to use the second equation to solve for delta g.
depends on what is given. if you know dG for both then the easiest way is to simply use those values. If they aren't given you are probably going to have to use enthalpy, temp, and entropy to find the dG values then subtract reactants from products
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