问题
填空题
| 词语运用。 1. It is s _____ of you to believe him. He is a dishonest man. 2. It is too late. How about _____ (come) here earlier tomorrow? 3. Could you _____ (possible)) open that window for me? 4. It's not polite _____ (嘲笑) blind people. 5. The hospital needs some _____ (志愿者) to help paint the house. |
答案
1. silly 2. coming 3. possibly 4. to laugh at 5. volunteers
N2＋3H2，达到平衡时，测得混合 气体的物质的量为3.6 mol，反应吸收的热量为73.6 kJ，下列表示氮气与氢气反应生成氨气的热化学反应方程式正确的是 [ ]
2NH3(g) ΔH＝－92 kJ/mol 
2NH3(g) ΔH＝－368 kJ/mol 
2NH3(g) ΔH＝－73.6 kJ/mol
2NH3(g) ΔH＝＋73.6 kJ/mol