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phamtham11b10
2 năm trước
Hòa tan hoàn toàn 10 g hỗn hợp gồm Al,Al2O3,Cu vào trong dd HCl 0,2M vừa đủ,sau phản ứng thu được dd A,đót nóng A trong không khí đến khối lượng không đổi cân nặng 2,75 gam. a)Tính phần trăm theo khối lượng của mỗi chất trong hỗn hợp đầu. b)Tính thể tích dd HCl 0,2 M đã dùng
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