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hongpham686
2 năm trước
Cho dòng khí H2 dư đi qua 54,4 g hỗn hợp bột CuO và một oxit sắt ngùn nóng. Sau khi các phản ứng xảy ra hoàn toàn , thu được 40g chất rắn và m gam nước. Cho một lượng chất rắn thu được tác dụng với dung dịch HCl dư, thu được m1 gam chấy rắn không tan và 13,44 lít khí H2(đktc) a, Viết PT phản ứng xảy ra b, Xác ddingj Ct oxit sắt, tính m
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