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. Nung nóng 16,8 gam bột sắt trong không khí thu được m gam hỗn hợp X gồm 4 chất rắn. Hoà tan hết m gam X bằng H2SO4 đặc nóng dư thoát ra 5,6 lit SO2 (đktc). Giá trị của m LÀM BẢO TOÀN E Ạ
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