题目

中国政府承诺，到2020年，单位GDP二氧化碳排放比2005年下降40%~50%。CO2可转化成有机物实现碳循环，有效降低碳排放。(1)已知：CO(g)+2H2(g)⇌CH3OH(g) ΔH1=-91kJ•mol-12CH3OH(g)⇌CH3OCH3(g)+H2O(g) ΔH2=-24kJ•mol-13CO(g)+3H2(g)⇌CH3OCH3(g)+CO2(g) ΔH3=-247kJ•mol-1则反应CO2(g)+3H2(g)⇌CH3OH(g)+H2O(g) ΔH=___________。(2)某温度下，在体积为1L的恒容密闭容器中，充入1molCO2和3molH2，一定条件下反应：CO2(g)+3H2(g)⇌CH3OH(g)+H2O(g)，测得CH3OH(g)浓度随时间变化如下图所示。①计算：从0min到3min，H2O的平 听对话，从A、B、C中选出你所听到的问题的正确答案，念两遍。 (     )1. A. In the library.                   (     )2. A. It was very cold.                  (     )3. A. Everyone.                         (     )4. A. He will ask her to               turn down the TV.(     )5. A. People don't need                  radios any more.   B. In a store.                    B. It was a sunny day.             B. All except Li Ming.              B. He will ask her    to turn up t he TV.B. He doesn't like     radios.           C. At a bus stop.                          C. It was rainy.                           C. Li Ming.                                C. He will ask her to     turn off the TV.     C. There will still be radios     in the world.