( giúp mình với mn ơi ) hỗn hợp X gồm 22g Al và Fe. chia thành 2 phần bằng nhau. phần 1 cho tác dụng với 400ml dung dịch Hcl 1,5M thu được V lít khí H2 phần 2 cho tá dụng với 800ml dung dịch HCl 1,5M thu được 8,96l H2 a) Tính V? b) Tính C% khối lượng kim loại trong X

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