Ответы и объяснения

2012-04-02T16:28:20+04:00

 

                                        Cu  Fe  S2

                                        64:56:64

                                           8:7:8     (8+7+8=23)

                        100%:23=4,35%

W(Cu)=4,35%*8=34,78%;W(Fe)=24,35%;W(S)=100%-(34,78+24,35)=40,87%