【摘 要】
：
By using a micro|bomb calorimeter, the standard enthalpies of combustion of C 60 and C 70 have been determined to be -(25 947.1±8.5) and -(29 956.1±
【出 处】
：
Science in China(Series B)
论文部分内容阅读
By using a micro|bomb calorimeter, the standard enthalpies of combustion of C 60 and C 70 have been determined to be -(25 947.1±8.5) and -(29 956.1±8.9) kJ/mol respectively. A g.l.c. analysis indicated that the amounts of residual organic solvents in the samples were very small, and their effects on the final results were negligible. The energy of combustion of C 60 determined in this work is in agreement in the uncertainty interval with that determined by means of traditional calorimeter using macro amount of sample. The enthalpies of formation of these two substances have been derived. The strain energies in the molecules of C 60 and C 70 were estimated by a bond energy scheme and by using corannulene as the model compound, the results estimated from different methods are very close.
其他文献
随着风机的广泛应用,其噪声问题日益突出。为了降低噪声,人们曾采取以下主要措施: 1.清声间或隔声室。这种方法在室内可降低噪声6～10dB,室外降低20～40dB。但此法投资很高,只能
琼是我刚中师毕业,在山村小学任教时的学生.那时,每学期开学要做的最重要的事是去辍学的学生家,请家长让孩子重返课堂,而期末要做的最重要的事是催学生交清学杂费.
１兵四进一２车五平四３兵三平四４兵四平五５兵五进一６兵五进一７兵五平四８马五退四９马四退五１０马五进七１２马七退五１４马五进七１６马七退五红先胜将６进１将６进１将６平５将５平４将４退１将４进１将４退１将４进１将４退１马２退３将４平５将５平６１１兵
以农业为主的柳州地区,地处桂中腹地,历年来投入较少,经济基础薄弱,财政收入增长缓慢,可用财力有限,收支矛盾突出。自1992年开始,个别贫困县出现了拖欠干部职工工资现象,199
本文介绍用高速钢钻头和立铣刀对镍基超耐热合金和高锰非磁性钢的加工。 超耐热合金 耐热合金大致可分为三种,即镍基、钴基、铁基合金,亦称为超耐热合金。其中,因科内尔合金*
The chemical ionization mass spectra of ten different glucosinolates isolated from rapeseed have been studied. More intense diagnoshc ions were identified than
请下载后查看，本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.
科技期刊是促进技术进步和传播知识的重要载体,科技期刊编辑在这个过程中发挥了重要作用。为了科技期刊更好地传承和发展,强调了培养科技期刊青年编辑的重要性。从获取职业资
最高能卖到6000多元的2匹空调柜机,成本到底是多少钱?日前,华高空调公司把它卖到了1980元。华高空调总经理黎同柱还同时摊牌:“2匹柜机的材料成本也就是在1800到2000元之
U
下班刚回到家，儿子就仰着小脸跑了过来：“妈妈妈妈，我给你讲个笑话吧！”我不禁皱眉。 最近不知怎么了，儿子迷上了讲笑话，看到我就要给我讲，而且一个接一个地讲，我不胜其烦。 看我不理会，他跺着脚嚷：“你到底听还是不听呀？” “不听。”我大声回他，转身进了厨房。转身的一刹那，我看见儿子一脸哭相地瘪了瘪嘴。我知道他生气了，无奈地摇了摇头。这孩子，我忙了一天，回到家还得操心做饭炒菜，哪有心思听你讲那些