Nung nóng 10,56g hỗn hợp X dạng bột gồm Fe và S trong khí trơ, hiệu suất pứ bằng a%, thu đc hỗn hợp rắn Y. Cho Y vào Đd HCl dư, sau khi các pứ xra hoàn toàn, thu đc 3,584 lít (đktc) hỗn hợp khí Z có tỉ khối so vs H2=5. Giá trị của a là gì

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