1/ Consider the three following reactions and the corresponding standard Gibbs energies: (1) Fe+S2=FeS2 with G1(500K)=300kJ and G1(1000k)=91kJ (2) 2Cu+1/2S2=Cu2S with G2(500K)=128kJ and G2(1000K)=101kJ (3) H2+1/2S2=H2S with G3(500K)=65kJ and G3(1000K)=16kJ a) Build an Ellingham diagram based on these 3 reactions. b) At what temperatures is it possible to reduce thermally FeS2 and Cu2S when Ps2=1 atm? c) Is it possible to reduce FeS2 with Cu ? If so under what conditions? d) Is it possible to reduce Cu2S with H2 ? If so under what conditions