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hòa tan hoàn toàn 3,12 gam hỗn hợp gồm 2 kim loại A và B đều hóa trị II bằng axit HNO3 đặc nóng. Sau pư thấy có 2,688 lít khí bay ra (đktc) a, Xác định tên 2 kim loại A và B. Biết $M_{A}:$ $M_{B}= 5:8$ b, tính khối lượng từng chất trong hỗn hợp khí
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