Cho 1 luồng khí CO đi qua ống sứ đựng 0,04 mol hỗn hợp gồm FeO và Fe2O3 đốt nóng. Sau thí nghiệm thu được 4 chất rắn có khối lượng 4,784g. Khi đi ra khỏi ống sứ hấp thu vào dung dịch Ca(OH)2 dư thu được 4,6g kết tủa. Tính % khối lượng FeO và Fe2O3 trong hỗn hợp ban đầu

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.

If many scientists conduct the same or similar experiments, and all obtain similar results, a can be written, which is a generally agreed-upon statement that explains and predicts how a natural phenomenon works.

If 2 molecules of one reactant combine with 3 molecules of another to produce 5 molecules of a product, then what is the representation of the reaction?