Question

An ion is reduced to the element when it absorbs ${6\times 10}^{20}$ electrons. the number of equivalents of the ion is:

Answer 1

1.12 litre of Hydrogen is displaced by metal $=1.2g$
So, 22.4 L of Hydrogen is displaced by metal $=\left(\frac{1.2g}{1.12}\right)\times \left(22.4\right)$
$=\frac{(12\times 224)}{112}=24g$
Hence Equivalent Mass of the metal is $24$.
Let Mass of the metal$=xg$
Mass of the metal oxide $=1.24x$
Mass of oxygen combining with metal$=1.24x-x=0.24x$
Now $0.24x$ g of Oxygen combines with metal$=xg$
So, 8 g of Oxygen will combine with metal$=\left(\frac{x}{0.24x}\right)\times 8=\frac{8}{0.24}=\frac{800}{24}=33.33$
Hence Equivalent Mass of the metal is $33.33$
Mass of an atom$=\frac{At.Mass}{Avogadr{o}^{\prime }sNumber}=\frac{(Valency\times Eq.Mass)}{N}$
$=\frac{(31.82\times 2)}{N}=\frac{63.64}{(6.023\times {10}^{23})}$
$=0.001$