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nobitatk933
2 năm trước
cho 8 g hỗn hợp bột sắt và mg vào 100ml dd Cu(no3)2 1,5M. Khi phản ứng xong thu được dd A và chất rắn B nặng 12,4g. Thành phần % và khối lượng sắt trong hỗn hợp ban đầu (làm theo cách lớp 9 viết pthh tìm số mol) Mọi người giúp mình với ạ!!
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