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thienthien.5.2.2003
2 năm trước
Câu 5: (3 điểm) Cho 33,3 gam hỗn hợp Al và Fe tác dụng hết với dung dịch HCl thu được 20,16 lít khí H2 (đktc). a/ Tính thành phần phần trăm theo khối lượng mỗi kim loại trong hỗn hợp ban đầu. b/ Cho 11,1 gam hôn hợp kim loại trên vào H,SO4 đặc, nóng thì thu được bao nhiêu lít khí SO2 (đktc). c/ Cho toàn bộ khí SO2 trên vào dung dịch KOH lấy dự thì thu được bao nhiều gam muối? Cho biết: H =1; 0 = 16 ; Al = 27 ; S = 32 ; Cl = 35,5 ; K = 39 ; Fe = 56
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