CxHy + (x + y/4) O2 == xCO2 + (y/2)H2O 1x + y/4 1mol 3mol1/1=（x + y/4）/3x + y/4=3x、y∈Z则x=2,y=4C2H4CH2=CH2乙烯学习进步~若觉得满意~请记得采纳~∩_∩...