文档介绍：2011届高考化学专题:气态烃燃烧计算
纯净物燃烧(差量法)例1. mL 某气态烃在 mL O2 中充分燃烧,得到液态水和 mL 的气体混合物(所有气体的体积都是在同温同压下测得的),                                                                                                                                                       
    解析:用体积差进行计算: 答案:BD
CxHy(g)+(x+)O2(g)  x CO2(g)+H2O(l)        V前-V后
      1                                                                                   1+
ml                                                                         +-= ml   y = 6
    例2. 某10ml气态烃在50mLO2中恰好充分燃烧,生成气态水,得到同状况下的气体70ml,求该烃的化学式。
CxHy(g)+(x+)O2(g) x CO2(g)+H2O(g)         V前-V后
1              x+                                                                  1-
10ml         50ml