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中学化学计算中,常遇到下列一类的计算题:二氧化氮与氧气的混和氧体溶于水。或二氧化氮与一氧化氮的混和气体溶于水后,再通入氧气,问最后剩余气体是什么?体积为多少?此时所得硝酸溶液的百分比浓度为多少?解答这类计算题所涉及的化学性质是:一般说来,水视作是过量的,NO_2能溶于水,NO、O_2不溶于水,所以最后NO_2气体不会剩余,只可能是NO或者是O_2气体剩余;NO_2与水反应生成HNO_3并且放出NO;NO与O_2反应生成NO_2同时。
In the middle school chemistry calculations, the following types of calculation problems are often encountered: The mixture of nitrogen dioxide and oxygen is soluble in water. Or the mixed gas of nitrogen dioxide and nitric oxide is dissolved in water, and then oxygen is introduced. What is the last remaining gas, how much is the volume, and what is the percentage concentration of the resulting nitric acid solution? The chemical properties are: Generally speaking, water is considered to be excessive, NO 2 can be dissolved in water, NO and O 2 are insoluble in water, so the last NO 2 gas will not remain, only NO or O 2 gas may remain; NO 2 and water The reaction generates HNO 3 and emits NO; NO reacts with O 2 to generate NO 2 simultaneously.