One litter of air at atmospheric pressure and 25C is held in

来源：学生作业帮编辑：作业帮分类：化学作业时间：2024/05/26 06:11:34

One litter of air at atmospheric pressure and 25C is held in a flask.the pressure of oxygen in the flask is 0.201 atm(20.4kpa).the concentration of oxygen in the flask ,in mole per litter is
A 8.2 B 0.12 C0.098 D0.0082 请问选哪个然后为什么

原文意思：25℃,一个大气压下,在烧瓶中盛有1L空气,氧气分压为0.201个大气压（20.4KPa）,问烧瓶中氧气的浓度为多少（用mol/L）?（应该是liter,而不是litter）
计算：根据PV=nRT
标况（101KPa,273K）下,1mol气体体积为22.4L,有101*22.4=1*R*273.(1)
现在（20.4KPa,298K,1L）,有20.4*1=nR*298.(2)
（2）/（1）得,n=273*20.4/(298*101*22.4)=0.008
所以选D

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