作业帮A newly discovered gas has a density of 2.39 g/L at 23.0°C
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A newly discovered gas has a density of 2.39 g/L at 23.0°C
and 715 mm Hg.What is the molar mass of the gas?
and 715 mm Hg.What is the molar mass of the gas?
理想气态方程（克拉伯龙方程）PV=NRT
由N=m/M ,PV=（m/M）RT,左边移过来,右边移过去就是PM=pRT p为密度.
M即为molar mass分子质量.
这里p=2.39 g/l,
T需要由摄氏温度转变为开氏温度T=23.0℃=273.15+23℃=296.15KP需要转换为帕斯卡P=715 mm hg=715 /7.5x10^-3=9.533x10^4 pa
R为常数=8.314,若p用帕（Pa）,V用升（L）为单位时,其数值为8315
M=61.94 g/mol
通过这个问题我也重新学习了下上学时的知识.
由N=m/M ,PV=（m/M）RT,左边移过来,右边移过去就是PM=pRT p为密度.
M即为molar mass分子质量.
这里p=2.39 g/l,
T需要由摄氏温度转变为开氏温度T=23.0℃=273.15+23℃=296.15KP需要转换为帕斯卡P=715 mm hg=715 /7.5x10^-3=9.533x10^4 pa
R为常数=8.314,若p用帕（Pa）,V用升（L）为单位时,其数值为8315
M=61.94 g/mol
通过这个问题我也重新学习了下上学时的知识.
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