Cho 4,4 gam hỗn hợp gồm Mg và CuO tác dụng với 200 ml dung dịch HCl (dư) thu được 2,24 lít khí (đktc). a. Tính khối lượng của mỗi chất trong hỗn hợp và nồng độ mol/lit của dung dịch muối thu được . biết thể tích dịch không thay đổi đáng kể. b. Phải dùng bao nhiêu ml dung dịch HCl 2M đủ để hoà tan 4,4 gam hỗn hợp.

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