Школьник Украины

Относительная плотность газов

Относительная плотность газов

Согласно второму следствием из закона Авогадро молярная масса вещества в газообразном состоянии равна его удвоенной плотности D по водороду:. Аналогично для воздуха, молярная масса которого равна 29 г / моль: Mгазу = Мпов · Dвозд = 29 · Dвозд Относительная плотность D с любым газом определяется экспериментально, а затем определяется молярная масса газа. Общая формула для определения относительной плотности D одного газа по другим будет выглядеть .

Например, определим относительную плотность фтора по воздуху. Для этого определим молярную массу фтора: M (F2) = 2 · Ar (F) = 2 · 19 = 38 
Относительная плотность фтора по воздуху равна:

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