将有机物完全燃烧,生成CO2和H2O。将12 g该有机物完全燃烧后的产物

将有机物完全燃烧,生成CO2H2O。将12 g该有机物完全燃烧后的产物通过浓H2SO4,浓H2SO4增重14.4 g,再通过碱石灰,碱石灰增重26.4 g。该有机物分子式为(  )

AC4H10                      BC2H6O

CC3H8O                     DC2H4O2

答案

C [n(H2O)0.8 mol

n(CO2)0.6 mol

有机物中氧元素的物质的量为:

n(O)

0.2 mol

n(C)∶n(H)∶n(O)0.6 mol∶(0.8×2) mol∶0.2 mol3∶8∶1,故有机物的分子式为C3H8O]

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