krypton at low temperatures to form the compound krypton difluoride(KrF2). In this case krypton has a valence of 2. Krypton’s melting point is –156.6°C, its boiling point is –152.30°C, and its density is0.003733g/cm3.物理属性:氪气(7439-90-9)的性状: 氪是无色、无大嗅和无味的...
氨在国民经济中占有重要的地位.2008年.我国氨产量接近500万吨.下图是合成氨的简要流程.(1)下表是空气中部分气体的沸点.将空气液化加热分馏.依据下表数据判断.最先气化得到的气体是氦气氦气. 气体名称 氨气 氧气 氦气 氖气 氩气 氪气 氚气 沸点/℃ -196 -183 -269 -2