题目

Macao is only forty miles from Hong Kong and it is easy to reach. You can get there by sea. It is an interesting place and it had a long history. Macao is part of China and most people living there are Chinese. The first Europeans to go to Macao came from Portugal. More than four hundred years ago the Portuguese went there to trade with China. Some settled and made their homes there. They built strong forts to guard（保卫） the city and the harbor. They also built churches, schools, hospitals and other places. Slowly the city grew. People from many countries came to live and work in Ma“嫦娥一号”探月成功，实现了中国人“奔月”的梦想．（1）“嫦娥一号”使用的推进剂是液氢和液氧，这种推进剂的优点是 ； （请写两条）．（2）下列是298K时，氢气（H2）、碳（C）、辛烷（C8H18）、甲烷（CH4）燃烧的热化学方程式：H2（g）+12O2（g）═H2O（l）△H=-285.8kJ/molC（g）+O2（g）═CO2（g）△H=-393.5kJ/molC8H18（l）+252O2（g）═8CO2（g）+9H2O（l）△H=-5518kJ/molCH4（g）+2O2（g）═CO2（g）+2H2O（l）△H=-890.3kJ/mol相同质量的H2、C、C8H18、CH4完全燃烧时，放出热量最多的是 ，通过计算说明等质量的氢气和碳燃烧时产生热量的比是 （保留1位小数）．（3）已知：H2（g）═H2（l）△H=-0.92kJ/molO2（g）═O2（l）△H=-6.84kJ/molH2O（l）═H2O（g）△H=+44.0kJ/mol请写出液氢和液氧生成气态水的热化学方程式： ．如果此次“嫦娥一号”所携带的燃料为1.08吨，液氢、液氧恰好完全反应生成气态水，总共释放能量 kJ（保留3位有效数字）．