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(12分)Ⅰ、氮元素的氢化物和氧化物在工业生产和国防建设中都有广泛应用。回答下列问题:(1)氮元素原子的L层电子数为__________; (2) NH 3 与NaClO反应可得到肼(N 2 H 4 ),该反应的化学方程式为_________________________; (3) 肼-空气燃料电池是一种碱性电池,该电池放电时,正极的反应式为________________________________。 Ⅱ、一定质量的液态化合物XY 2 在标准状况下的一定质量的O 2 中恰好完全燃烧,反应方程式为: XY 2 (l)+3O 2 (g) ='==' XO 2 (g)+2YO 2 (g)冷却后,在标准状况下测得生成物的体积是672 mL,密度是2.56g/L则: (1)反应前O 2 的体积是________。(2)化合物XY 2 的摩尔质量是___________。 (3)XY 2 分子中X、Y两元素质量比是3∶16, X、Y两元素分别为__________ (写元素符号)。
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