Question

In a Victor Meyer's determination of molecul mass, 0.15 g of a volatile substance displaced 31.6 mL of air at 25°C and 755 mm pressure. Calculate the molecular mass of the substance.
​

Answer 1

Answer:

Mass of the organic substance

<br> Volume of the displaced air

<br> Temperature at which air is collected

<br> Pressure at which air is collected

<br> Aqueous tension at

<br> Pressure of the dry air

<br> Step I. Calculationof the volume of the air displaced (or vapours of the substance) at N.T.P. <br>

<br> By applying gas equation : <br>

<br> or

<br> Step II. Calculation of the molecular mass. <br> 111.6 mL of vapours are obtained from subtance = 0.60 g <br> 22400 mL of vapours are obtained from substance

<br>

Molecular mass of the substance