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一、选择题1.将氯化钾和溴化钾混和物13.4克溶于水制成500毫升溶液,通入过量的氯气,充分反应后蒸干,得到11.175克晶体,则原配制溶液中K~+、Br_-、cl_-的物质的量浓度之比是( )(A)3:2:1 (B)1:2:3(C)1:3:2 (D)2:1:32.接触法制硫酸时,进入接触室的混和气体组成为:SO_2 7%,O_211%,N_2 82%,如果反应后,在温度和压强不变的情况下,混和气体的体积变为原来的97.2%,则SO_2的转化率为( )(A)50%(B)60%(C)70%(D)80%3.在30℃时饱和硫酸铜溶液中投入6.875克无水硫酸铜后,析出12.5克胆矾晶体.则30℃时饱和硫酸铜溶液的质量百分比浓度是( )
First, the multiple-choice 1. Potassium chloride and potassium bromide mixture 13.4 grams dissolved in water to make a 500 ml solution, pass the excess chlorine, after sufficient reaction and evaporated to dryness, to obtain 11.175 grams of crystals, the original preparation of the solution K The ratio of the concentration of the substances of ~+, Br_-, cl_- is () (A) 3:2:1 (B) 1:2:3 (C) 1:3:2 (D) 2:1:32 In the case of sulphuric acid in contact with sulphuric acid, the composition of the gas entering the contact chamber is: SO 2 7%, O_211%, N_2 82%. If the temperature and pressure do not change after the reaction, the mixed gas volume becomes 97.2% of the original. The conversion rate of SO 2 is () (A) 50% (B) 60% (C) 70% (D) 80% 3. After 6.875 g of anhydrous copper sulfate is added to a saturated copper sulfate solution at 30°C, it is precipitated. 12.5 grams of cholesteric crystals. The mass concentration of saturated copper sulfate solution at 30°C is ()