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13问答网 > 某烃的衍生物分子中含C、H、O三种元素，若将其分子式写成（CH2）m（CO2）n（H2O）p，当它完全燃烧时，生

某烃的衍生物分子中含C、H、O三种元素，若将其分子式写成（CH2）m（CO2）n（H2O）p，当它完全燃烧时，生

2025-03-16 04:00:12

推荐回答（1个）

回答1：

有机物分子式写成（CH₂）_m（CO₂）_n（H₂O）_p，完全燃烧耗氧量由分子式中（CH₂）_m决定，令有机物为1mol，则消耗氧气物质的量n（O₂）=（m+

2m

4

）mol=1.5m mol，根据碳原子守恒可知n（CO₂）=（m+n）mol，生成的CO₂与消耗的O₂在同温同压下体积比为1：1，则（m+n）mol：1.5m mol=1：1，解得m：n=2：1，
故选D．

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