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dung dch (gi s ton b SO2 vo nc). Ly 10 ml dung dch ny em chun vi dung dch
KMnO4 nng 0,005M. Th tch dung dch KMnO4 cn dng l 12,5ml. Hi loi nhin liu trn
c c php s dng khng? Ti sao?
b) Ho tan hon ton mt lng oxit FexOy bng dung dch H2SO4 c nng thu c 2,24 lt SO2
(ktc). Phn dung dch em c cn c 120 gam mui khan. Vit phng trnh phn ng xy ra v
tm cng thc ca oxit FexOy.
Cu 8: Nhit phn hon ton m gam hn hp A gm KMnO4 v KClO3 thu c kh O2 v hn
hp rn B. Trong B c 0,894 gam KCl chim 8,132% khi lng hn hp B. Lng kh O 2 to ra
trn c trn vi khng kh theo t l th tch tng ng l 1:3, thu c thu c hn hp kh D.
Sau khi cho hn hp D t chy ht 0,528 gam cacbon, thu c hn hp kh E gm 3 kh, trong
c 22,92 % CO2 theo th tch. Hi m c th nhn nhng gi tr no c th tha mn iu kin
ca bi ton. Tnh % khi lng cc cht trong A ng vi gi tr ca m. (Bit khng kh c 20% th
tch O2, 80% l N2).