Ngày tải lên :
16/07/2014, 13:28
... 8,00% C Tng 8 ,97 % D Tng 7,71 Chn m = 7,84 mdd = 98 gam nH2 = nH2SO4 = 98 .0,14 /98 = 0,14 mol mX = 98 + 7,84 0,14.2 = 105,56 gam = (105,56 98 ) /98 = 7,71% Cõu 3: t chỏy hn hp gm 1 ,92 gam Mg v ... FeS2 hn hp ban u A 71,53% hoc 81, 39% B 93 ,23% hoc 71,53% C 69, 23% hoc 81, 39% D 69, 23% hoc 93 ,23% TH1: Cú Fe2(SO4)3 v CuSO4 120 x + 160 y = 5, x = 0, 03 % FeS = 69, 23 14, x + 11 y = 0,545 y ... u A 71,53% hoc 81, 39% B 93 ,23% hoc 71,53% C 69, 23% hoc 81, 39% D 69, 23% hoc 93 ,23% FeS2 : a Cu2 S : b 32 32 TH1: TH2: Fe ( NO3 ) 120a + 160b = 5, a = 0.0404 % FeS = 93 , 23 11a + 8b = 0,545...