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nhun1408
2 năm trước
Câu 1: Xác định hóa trị của các nguyên tố không phải là oxi và hiđro trong các hợp chất sau: FeO; Fe2O3; NO2; CH4 Câu 2: Cho các nguyên tố và nhóm nguyên tử (kèm theo hóa trị). Hãy lập công thức của các chất sau: a) muối của K với nhóm nguyên tử NO3; PO4; SO4 b) muối của Ba với nhóm nguyên tử NO3; PO4; SO4 Câu 3: Xác định khối lượng, thể tích khí (ở đktc) và số lượng phân tử có trong mỗi lượng chất sau: a) 0,25 mol chất khí CH4 b) Hỗn hợp khí gồm có: 0,3 mol CO2 và 1,15 mol O2
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