恒温下，将a mol N2与b mol H2的混合气体通入一个固定容积的密闭容器中，发生如下反应：
N2(g)+3H2(g)
2NH3(g)。
（1）若反应进行到某时刻t时，nt (N2)＝13mol，nt (NH3)＝6mol，计算a的值
（2）反应达平衡时，混合气体的体积为716．8L(标况下)，其中NH3的含量(体积分数)为25%。计算平衡时NH3的物质的量。
（3）原混合气体与平衡混合气体的总物质的量之比(写出最简整数比，下同)，n(始)∶n(平) ＝________。
（4）原混合气体中，a∶b＝________。
（5）达到平衡时，N2和H2的转化率之比，(N2)∶(H2)＝________。
（6）平衡混合气体中，n(N2)∶n(H2)∶n(NH3)＝________。
（1）16
（2）8mol
（3）5:4
（4）2:3
（5）1:2
（6）3:3:2
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| Shirley Yeats is certainly a very brave woman! At the age of sixty-seven, she 1 to take a trip round the coast (海岸) of Malaysia. Everything was fine 2 one day, as she was going back to her room on the 3 , she saw smoke coming out of another room. She 4 the captain from her room at once and told him about the fire. Then she went up on deck (甲板) to see 5 she could do to help. The fire spread (蔓延) very quickly and soon 6 was completely out of control. The captain decided to get all the passengers out as 7 as possible. Many of the other passengers were 8 , but Shirley remained calm (镇静的). She even helped the other passengers to 9 the lifeboats. All 1,000 passengers were in the lifeboats and not one passenger 10 in the fire. Shirley was one of the last people to leave. Later, she told reporters," I was very afraid, 11 I always knew what I had to do. I 12 all my years as a teacher helped----all that time telling people what to do!" | ||||
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