1.a chemical element whose oxides contain five atoms of oxygen in each molecule
1.Causticizing mud was used as a roasting additive of sodium chloride for extraction of vanadium pentoxide from stone coal.
从石煤中提取五氧化二钒时，用苛化泥作焙烧添加剂，以取代氯化钠。
2.The purity of vanadium pentoxide was more than 99%.
产物五氧化二钒的纯度大于99%。
3.The principles and low pollution process in production of vanadium pentoxide with stone coal containing vanadium are introduced in detail.
介绍用含钒石煤生产五氧化二钒的原理和低污染生产工艺。
4.Arsenic pentoxide (As2O5) is also used in insecticides, herbicides, metal adhesives, and pigments.
五氧化二砷（AS2O5）是杀虫剂、除草剂以及金属黏合剂的主要成分。
5.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。
6.Silica refractories--Determination of phosphorus pentoxide content--Molybdenum blue photometric method
硅质耐火材料化学分析方法钼蓝光度法测定五氧化二磷量
7.Fireclay and high-alumina refractories--Determination of phosphorus pentoxide content--Molybdenum blue photometric method
粘土、高铝质耐火材料化学分析方法钼蓝光度法测定五氧化二磷量
8.Improvement of the Method of Volumetric Analysis for the Determination of Di-phosphorus Pentoxide in Phosphoric Acid
容量法测定磷酸中五氧化二磷的方法改进
9.Nitration of Toluene with a Clean Nitrating Agent - Dinitrogen Pentoxide
绿色硝化剂五氧化二氮对甲苯的硝化研究
10.Extraction of Vanadium Pentoxide from Stone Coal with a Wet Chemical Separation Method
湿法提取石煤中钒的新工艺研究