Question

Name the gas displaced in Victor Meyer’s method.

Answer 1

no gas was replaced

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Answer 2

"The gas displaced in "Victor Meyer's method" is air. This method is primarily used in the "determination" of "molecular weight" of the given unknown liquid. This method is based on the principle,

Volume of the air displaced = volume of the known mass of the vapour  

First, the unknown liquid is vaporised under suitable conditions and constant high temperature. This vapour displaces the air in the chamber. Then the displaced air is "cooled" to "room temperature" and its "volume" is carefully measured. Since, the pressure, volume, and the temperature remains constant, by Avogadro's Law the "number of moles of gas" (air) in the chamber is the same before and after volatilization. Four or five runs are done till consistent result is obtained. "Molar mass" of the unknown liquid is calculated using the ideal gas equation

$PV\quad =\quad \left( \frac { Sample\quad mass }{ Molar\quad mass }  \right) RT$"