Combustion of a 0.9835-g sample of a compound containing only carbon,hydrogen,and oxygen produced 1.

Combustion of a 0.9835-g sample of a compound containing only carbon,hydrogen,and oxygen produced 1.

题目
Combustion of a 0.9835-g sample of a compound containing only carbon,hydrogen,and oxygen produced 1.900 g of CO2 and 1.070 g of H2O.
a.What isthe empirical formula of the compound?
答案
化合物中含有C的质量:1.900*(12/44)=0.5182g
化合物中含有H的质量:1.070*(2/18)=0.1189g
化合物中含有O的质量:0.9835-0.5182-0.1189=0.3464g
则:分子式中系数之比:
0.5182/12 :0.1189/1 :0.3464/16
=0.04318 :0.1189 :0.02165
=4:11:2
所以,经验化学式为:C4H11O2或者[C4H11O2]n
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
最新试题
热门考点

超级试练试题库

© 2017-2019 超级试练试题库,All Rights Reserved.