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Nung nóng hỗn hợp X gồm 11,2 g bột Fe và 3,2 g bột s (trong bình kín không có Oxi )tới phản ứng hoàn toàn thu được chất rắn Y .cho Y tác dụng vừa đủ với 500 ml dung dịch HCl aM thu được hỗn hợp khí A và dung dịch B A,Tính tỉ khối của hỗn hợp A so với Hidro B, Tính giá trị của A
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