Khử 160 gam quặng hematit(chứa 80% Fe2O3,còn lại là tạp chất trơ) bằng khí cacbon oxit đun nóng,sau phẩn ứng thu được chất rắn A và khí .Biết hiệu suất phản ứng đạt 75%. a)Tính thể tích khí B(ĐKTC). b)Tính khối lượng A

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