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Hanhuyen
2 năm trước
Hỗn hợp A gồm Fe3O4 và Al. Tiến hành phản ứng nhiệt nhôm với m(g) hỗn hợp A, sau khi để nguội thu đc chất rắn B. Trộn đều hỗn hợp B rồi chia làm 2 phần =nhau. -P1: hoà tan trong H2SO4 dư đc V(l) khí C(đktc) và hỗn hợp D. Cho D tác dụng với NaOH dư được kết tủa E đem phơi ngoài kk để chuyển hết thành rắn F. Biết khối lượng rắn E khác rắn F là 8,5g. -P2: tác dụng vs dd KOH dư thấy còn lại rắn G ko tan và thoát ra ngoài 1,68l khí C(đktc) . Biết khối lượng G< lượng phần 2 là 11,55g. a) Tính m,V b) Tính hiệu suất phản ứng nhiệt Al
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