设COxmol CO2 ymol
总体积是8.96L,则总物质的量是8.96/22.4=0.4mol
所以x+y=0.4
28x+44y=14.4
解得x=0.2 y=0.2
即CO的质量是0.2*28=5.6g
CO2的物质的量是0.2mol