题目

2.0 mol PCl3和1.0mol C12充入体积不变的密闭容器中，在一定条件下发生下述反应：    PCl3(g)+ C12(g)  PCl5(g) 达平衡时，PCl5为O.40mol，如果此时移走1.O mol PCl3和0.50 mol C12，在相同温度下再达平衡时, PCl5的物质的量是A．0.40 mol     B.0.20 mol     C.小于0.20 mol     D.大于0.20 mol,小于0.40 mol 答案：CA： Hello,may I speak to Ann,please?B： Hello. 1       Is that Mary?A ： Yes. I hear you weren’t well yesterday. 2        B : I fell off the bike and hurt myself. A： 3       B： Much better. Thanks. Maybe I can go to school tomorrow. A： Oh,I think you should stay in bed and have a rest.B： Maybe you’re right. 4       A ： Don’t worry. I can help you.B： It’s very kind of you. 5       A ： It’s my pleasure.(   ) 1.  A. That sounds boring.   B. It’s a blue one.   C. This is Ann speaking.   D. Is this enough?(   ) 2.  A. I need to buy some drinks and snacks.   B. I don’t think so.   C. I’d like to go to school.   D. What was the matter?(   ) 3.  A. See you tomorrow.   B. I need to get there on time.   C. Are you better now?   D. Open the door.(   ) 4.  A. It must be David’s.   B. How do you do?   C. What colour is it?   D. But I’m worried about my lessons.(   ) 5.  A. I don’t know.   B. Thanks a lot.   C. Here you are.   D. Where’s my homework?