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Calculate the value of Delta G^0 for the following reactions and interpret the results:
(a) Ca(OH)2(s) + H2SO4(l) → CaSO4(s) + 2H2O(l)
(b) 2NH4Cl(s) + CaO(s) → CaCl2(s) + H2O(l) + 2NH3(g)