The oxidation of ferrous iron (Fe2+) to ferric iron (Fe3+) by molecular oxygen can be described by the following reaction:4R"(aq) + 02(3) + «ii-Natl) - 4Fc"(aq) + 2H20(l)(a) Using free energies of formation, calculate the equilibrium constant for this reaction at 25°C.(b) For a water in equilibrium with the atmosphere, a pH of 20, and a total soluble iron concentration of 1 mg/ L, calculatethe concentrations of Fe2+(aq) and Fe3+{aq).

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.