N an oxide of an element with five atoms of oxygen per molecule 五氧化物
One dinitrogen pentoxide molecule contains two nitrogen atoms and five oxygen atoms.
分子中含有两个氮原子和五个氧原子。
The method was used to determine the content of di-phosphorus pentoxide in phosphoric acid and the result was satisfactory.
本方法用于测定磷酸中五氧化二磷的含量，获得满意结果。
A new complex ion exchanger, hydrated antimony pentoxide ammonium molybdophosphate, is prepared and its exchanging capacity is studied.
研究了水合五氧化二锑磷钼酸铵复合无机离子交换剂的制备和交换性能。
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