Bài 1 :Hoàn thành PT A,N2O5+H2O--->HNO3 B,Fe2O3+CO---->Fe+CO2 C,KOH+H2SO4---->K2SO4+H2O D,Ca(OH)2+H3PO4---->CA3(PO4)+H2O E,Al+O2---->Al2O3 Bài 2:quặng hematit có thành phần chính là sắt (III)oxit Fe2O3.Dùng 0,6kg khí hydro khử 18 kg quặng hematit thì thu được 11,2 kg sắt và 5,4kg nước A.lập pthh của phản ứng B.viết công thức về khối lượng của các chất trong phản ứng C.tính khối lượng của sắt (III)oxit tham gia phản ứng D.tính tỉ lệ phần trăm về khối lượng sắt (III) oxit chứa trong mẫu quặng

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