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longthannghihv
2 năm trước
Để a gam bột sắt ngoài không khí, sau một thời gian sẽ chuyển thành hỗn hợp A gồm 4 chất rắn có khối lượng 75,2 gam. Cho hỗn hợp A phản ứng hết với dd H2SO4 đặc nóng dư thấy thoát ra 6,72 lit SO2 (đktc). Tính a ? BẢO TOÀN E Ạ
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