这种有机物蒸汽的质量是同温同压下同体积N2的两倍说明其摩尔质量是N2的2倍,即56g/mol.
有机物：2.8g ÷ 56g/mol = 0.05mol.
CO2：8.8g ÷ 44g/mol = 0.2mol,含C：0.2mol.
H2O：3.6g ÷ 18g/mol = 0.2mol,含H：0.4mol.
2.8g - 12g/mol×0.2mol - 1g/mol×0.4mol = 0g,有机物不含O.
0.2÷0.05=4,0.4÷0.05=8,有机物分子式为：C4H8.
实验式为CxHyN2Ow,根据N的质量分数为8.48%,可知有机物的相对分子质量为14×2÷8.48%=330.
x = 330 × ( 26.67 × 12/44 ÷ 10 ) ÷ 12 = 20
y = 330 × ( 8.18 × 2/18 ÷ 10 ) ÷ 1 = 30
w = ( 330 - 12×20 - 1×30 - 14×2 ) ÷ 16 = 2
分子式为：C20H30N2O2.