题目

Bodensteins研究了下列反应： 2HI(g) H2(g)＋I2(g) 在716K时，气体混合物中碘化氢的物质的量分数x(HI)与反应时间t的关系如下表： t/min020406080120 x(HI)10.910.850.8150.7950.784 x(HI)00.600.730.7730.7800.784 ①根据上述实验结果，该反应的平衡常数K的计算式为 _____________________________________________。 ②上述反应中，正反应速率为v正＝k正x2(HI)，逆反应速率为v逆＝k逆x(H2)x(I2)，其中k正、k逆为速率常数，则k逆为________(以K和k正表示)。若k正＝0.0027min－1，在t＝40min时，v正＝________mi根据贺卡的格式，为下列语句排序，将正确的顺序写在横线上。1. Write what you want to say on the paper. 2. First, you should write the date. 3. Finally, write your name at the end of the card. 4. Write your friend’s or family’s name. We often put a “dear” in front of the name. 5. We often write some wishes like “Happy New Year” at the end of the card. 正确的顺序： ________________________________