Question

$1.00g$ of a chlorid of an element contains $0.835g$ of chlorine. If the vapour density of the chloride is $85$, find the atomic weight of the element an its valency.

Answer 1

Mass of metal chloride =1g

Mass of chlorine = 0.835g

Mass of metal = 1-0.835=$0.165g$

Equivalent mass of metal=$\frac{0.165}{0.835}\times 35.5=7.01$
Valency of metal=$\frac{2\times vapourdensity}{E+35.5}$$=\frac{2\times 85}{7.01+35.5}=4$
Thus, the atomic mass of the element $=Equivalentweight\times valencey$

$=7.01\times 4$

$=28.04g/mol$