明天就月考了,汽油（設(shè)代表式為CnCOm）燃燒配平,帶字母的配平,打錯(cuò)了是CnH...

【專家解說】：汽油應(yīng)該是CnH2n.燃燒的化學(xué)式為CmHn+O2=點(diǎn)燃=CO2+H2O用觀察法配平前面是你個(gè)碳后面也是,所以二氧化碳前配mCmHn+O2=點(diǎn)燃=mCO2+H2O水前面配n/2CmHn+O2=點(diǎn)燃=mCO2+n/2H2O配氧氣CmHn+（m+n/4)O2=點(diǎn)燃=mCO2+n/2H2O最后化成整數(shù)乘以4即可4CmHn+（4m+n)O2=點(diǎn)燃=4mCO2+2nH2O如果是CnHm就是CnHm+（n+m/4)O2=點(diǎn)燃=nCO2+m/2H2O不懂問