Hòa tan hết 20,48 gam hỗn hợp gồm Mg, MgO, MgCO₃ trong dung dịch H₂SO₄ và NaNO₃, kết thúc phản ứng thu được dung dịch X chỉ chứa 3 muối trung hòa có khối lượng 84,63 gam và hỗn hợp khí Y gồm CO₂, N₂O, N₂, H₂ (trong đó có 0,06 mol H₂). Tỉ khối của Y so với He bằng 7,45. Cho dung dịch BaCl2 dư vào dung dịch X, thu được 160,77 gam kết tủa. Nếu cho dung dịch Ba(OH)₂ dư vào dung dịch X, thu được 195,57 gam kết tủa. Phần trăm về số mol của N₂O trong hỗn hợp khí Y là:

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