题目

氮是地球上含量丰富的一种元素，氮及其化合物在工农业生产、生活中有着重要作用，合成氨工业在国民生产中有重要意义。以下是关于合成氨的有关问题，请回答： （1）若在一容积为2 L的密闭容器中加入0.2 mol的N2和0.6 mol的H2，在一定条件下发生反应：N2(g)＋3H2(g)2NH3(g) ΔH<0，若在5分钟时反应达到平衡，此时测得NH3的物质的量为0.2 mol。则前5分钟的平均反应速率v(N2)＝________。平衡时H2的转化率为________。 （2）平衡后，若要提高H2的转化率，可以采取短文理解.1. Bruce, Dick and John are _____ in the same _____.    A. students; class                       B. teachers; school    C. students; school                      D. teachers; class2. _____ is new. He is in _____ class.    A. John; Bruce's     B. John; Dick's     C. Dick; Bruce's     D. Dick; John's3. It is a little hard for _____ to do his lessons.    A. John     B. Bruce     C. Dick     D. them all4. Bruce and Dick _____ in the morning last Sunday.    A. went to swim     B. went to see John    C. watched a football game     D. did their lessons5. What did Bruce do in the afternoon last Sunday?    A. He did some reading.     B. He went swimming.    C. He stayed at home.     D. He helped Dick with his lessons.