题目

The world is not coming to an end on December 21, 2012, the US space agency insisted Monday in a rare campaign to dispel widespread rumors fueled by the Internet and a new Hollywood movie. The latest big screen offering from Sony Picture, 2012, arrives in theaters on Friday, with a 200-million-dollar production about the end of the world supposedly based on myths backed by the Mayan calendar. It is claimed that the end of time will come as a Planet X---or Nibiru---heads toward or collides with the Earth. Some websites accuse NASA of hiding the truth on the planet’s existence, but the US spa700℃时，向容积为2L的密闭容器中充入一定量的CO和H2O，发生反应：CO(g)＋H2O(g) CO2(g)＋H2(g)反应过程中测定的部分数据见下表（表中t2＞t1）：反应时间/minn(CO)/moln (H2O)/ mol01.200.60t10.20t20.80依据题意回答下列问题：（1）反应在t1min内的平均速率为v(H2)＝____________mol·L－1·min－1（2）保持其他条件不变，起始时向容器中充入0.60molCO和1.20 molH2O，到达平衡时，n(CO2)＝____________mol。（3）温度升至800℃，上述反应平衡常数为0.64，则正反应为__________反应（填“放热”或“吸热”）。（4）700℃时，向容积2L的密闭容器中充入CO(g)、H2O(g)、CO2(g)、H2(g)的物质的量分别为1.20mol、2.00mol、1.20mol、1.20mol，则此时该反应v（正）______v（逆）（填“>”、“<”或“=”）。（5）若该容器体积不变，能判断反应达到平衡的是_______________。①c(CO)与c(H2)的比值保持不变；②v(CO2)正＝v(H2O)逆；③体系的压强不再发生变化；④混合气体的密度不变；⑤体系的温度不再发生变化；⑥气体的平均相对分子质量不变