今有H2、CO、CH4的体积比为1:1:2的混合气体VL ,当其完全燃烧时,所需O2的体积为(相同条件下)                                                                                                                                           (     )A.1.25VL                       B.0.75VL                                C.5VL                               D.VL  

问题描述:

今有H2、CO、CH4的体积比为1:1:2的混合气体VL ,当其完全燃烧时,所需O2的体积为(相同条件下)                                                                                                                                           (     )
A.1.25VL                       B.0.75VL                                C.5VL                               D.VL  

设氢气的体积为V 则一氧化碳体积为V 甲烷的体积为2V
根据方程式:一体积的氢气消耗0.5体积的氧气
一体积的一氧化碳消耗0.5体积的氧气
一体积的甲烷消耗2体积的氧气
所以四体积的混合物烧了四体积的氧气
答案:D