please answer a-d and show work.

4. Determine the G and K for the following reactions using tabulated values for G from Appendix A in the text. Provide the reference if using a resource other than the text. Note that Fe(OH)3(s) is listed as an amorphous solid and CaSO4.2H2O(s) is listed as gypsum. GA (a) Fe3+ + 3OH = Fe(OH)3(s) - 699 (-712) (b) Mg2+ + OH = MgOH -626.8 (c) Ca2+ + SO42- +2H20 = CaSO4.2H2O(s) -1797.2 (d) HASO42- + H+ = H2As04 - 756-0 =