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通常说“纯净”的NO2或N2O4实际上并不纯净,因为在常温常压下能发生2NO2(?)N2O4反应．由于此可逆反应的发生,通常实验室测得NO2的相对分子质量大于它的实际值,或在相同条件下比同物质的量的气体体积小;同理通常测得N2O4的相对分子质量小于它的实际值,或在相同条件下比同物质的量的气体体积大．因此在解题时若忽视了此反应
Generally speaking, “pure” NO2 or N2O4 is actually not pure because 2NO2(?)N2O4 reaction can occur under normal temperature and pressure. Due to the occurrence of this reversible reaction, the relative molecular mass of NO2 in the laboratory is generally greater than its actual value, or is smaller than the volume of gas of the same substance under the same conditions; similarly, the relative molecular mass of N2O4 is usually smaller than that of N2O4. The actual value, or under the same conditions, is larger than the volume of gas of the same substance. So if you ignore this reaction when solving a problem