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Lấy 93,9 gam Fe3O4 trộn với Al được hỗn hợp X. Nung hỗn hợp trong mỗi trường không có không khí, sau khi phản ứng xảy ra hoàn toàn, ta thu được hỗn hợp Y. Chia Y thành 2 phần: - Phần 1: tác dụng với dung dịch NaOH dư cho 0,672 lít khí H2 - Phần 2: tác dụng với dung dịch HCl dư cho 18,816 lít khí H2 Tính khối lượng các chất trong hỗn hợp ban đầ
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