... g cht rn Thnh phn %(m) ca Fe v Zn A ln lt l (%) A 50 , 85; 49, 15 B 30, 85; 69, 15 C 51 , 85; 48, 15 D 49, 85; 50 , 15 34 Cho hn hp gm 0,3 mol Fe + 0, 15 mol Fe2O3 + 0,1 mol Fe3O4 tc dng ht vi dung dch H2SO4 ... khng b bin i Phn trm cht mui l (%) A 8 ,5 B 6 ,5 C 7 ,5 D 5, 5 55 Trong cc hp cht, crom c s oxi ph bin l A +2, +3, +7 B +2, +4, +6 C +2, +3, +6 D +2, +3, +5, +7 56 Ngõm mt lỏ kim loi cú lng 10g dung ... C. 35% D 50 % 94 Cho 20 gam hh Fe v Mg tỏc dng ht vi dd HCl thy cú 1,0 gam khớ hirụ thoỏt em cụ cn dung dch sau phn ng thỡ thu c bao nhiờu gam mui khan A 50 gam B 60 gam C 55 ,5 gam D 60 ,5 gam 95...