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2 năm trước
Bài 1: trong phòng thí nghiệm để điều chế khí oxi người ta tiến hành phân hủy thuốc KMnO4 a,viết PTHH cho phản ứng trên b,tính thể tích khí oxi sinh ra ở (đktc) khi phân hủy 79g thuốc tim KMnO4 c,tính khối lượng oxit sắt từ được tạo thành khi cho toàn bộ khí oxi sinh ra ở trên oxi hóa 44,8g sắt ở nhiệt độ cao. Biết phản ứng xảy ra hoàn toàn. Cho biết: (K=39, Mn=55, O=16, Fe=56)
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