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全国统编教材高中第二册(甲种本)第三章第二节P.71—72以及乙种本下册第一章第二节P.7—8有这样一段内容:“在500℃1 标准大气压时,把2体积的二氧化硫和1体积的氧气的混和物,通入一个装有催化剂的密闭容器里。反应开始后,SO_2和O_2的浓度逐渐减小。SO_3的浓度逐渐增大,最后能得到含91%(体积组成)三氧化硫的混和气体。这时候,容器里反应物SO_2、O_2和生成物SO_3在混和物中的浓度就不再发生变化。”另一段是:“如果我们不是从SO_2和O_2的混和物开始反应,而是使纯
The National Unified Textbook High School Vol.2 (A Type of Breeding), Chapter III, Section II, P.71-72, and Type B, Chapter One, Section II, Section P.7-8 have such a content:”At 500 °C1 At normal atmospheric pressure, a mixture of 2 volumes of sulfur dioxide and 1 volume of oxygen is passed into a closed container filled with a catalyst, and after the start of the reaction, the concentrations of SO 2 and O 2 gradually decrease, and the concentration of SO 3 gradually increases. Finally, a mixed gas containing 91% (by volume) of sulfur trioxide can be obtained. At this time, the concentrations of the reactants SO 2 , O 2 and product SO 3 in the container no longer change in the mixture. "If we don’t start the reaction from the mixture of SO_2 and O_2, but make it pure