KIM TRA 2Bi 1 Cho m gam hn hp Cu v Fe2O3 trong dung dch H2SO4 loóng d thu c dungdch X v0,328 m gam cht rn khụng tan. Dung dch X lm mt mu
va ht 48ml dungdch KMnO4 1M. Giỏ tr ca m l:A.42B.45C.40D.48FeCl2b=0,24b=0,122X 0, 672m = 224b m = 40CuCl2 bBi 2 Cho m gam Fe vao 1 lit dd gom H2SO4 0,1M,[r]