题目

A compound contains only carbon,hydrogen,and oxygen.Combustion of 10.68 mg of the compound yields 16.01 mg CO2 and 4.37 mg H2O.The molar mass of the compound is 176.1 g/mol.What are the empirical and molecular formulas of the compound?(Type your answer using the format CO2 for CO2.)
empirical formula
_____________
molecular formula
_____________

提问时间：2021-03-27

答案

n(C)=0.01601/44=3.64*10^(-4)mol
n(H)=0.00437/18*2=4.86*10^(-4)mol
n(O)=[m(总）-m(H)-m(C)]/M(O)=3.64*10^(-4)mol
n(化合物）=0.01068/176.1=0.61*10^(-4)mol
n(化合物）:n(C):n(H):n(O)
=1:6:8:6
分子式为：C6H8O6