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dangcapladay
2 năm trước
5: để điều chế khí oxy trong phòng thí nghiệm người ta dùng thuốc tím nhiệt phân ở nhiệt độ cao và sản phẩm còn lại: kali manganat K2MnO4, mangan dioxit MnO2 a. Viết PTHH xảy ra B. Khối lượng thuốc tím cần dùng để thu được 5,6l oxy ở đktc C. Tính tổng khối lượng sản phẩm rắn sinh ra. 6. Ở các nhà máy nước nước được phun qua các giàn mưa để tách sắt theo PTHH như sau: Fe(OH)2+O2+H2O->Fe(OH)3 A. Hoàn hành pthh trên. B. Sắt (III) hydroxit Fe(OH)3 không tan được tách ra ở dạng chất rắn trong bể lắng để tách được 2140kg Fe(OH)3 thì cần dùng bao nhiêu m³ O2 (đktc)
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