Question

The molecular mass of trivalent metal oxide is 160. The equivalent mass of the metal in the oxide is


( A )

18.67
( B )

37.2
( C )

16.87
( D )

9.3

Answer 1

a. 18.67 this is your answer

Answer 2

Answer:

The equivalent mass of metal $M^{3+}$  in $M_{2}O_{3}$ is equal to $26.67geq^{-1}$.

Explanation:

The metal is trivalent : $M^{3+}$

The oxide are: $O^{2-}$

To write the formula metal oxides:

The superscript of one element becomes subscript of other element.

So, the formula of metal oxide $= M_{2}O_{3}$

We know, Equivalent mass =(Molar mass)/(n-factor)

Given, molar mass of $M^{3+}=160gmol^{-1}$

and, n-factor of $M_{2}O_{3}=2*3=6$

Therefore, equivalent mass $=\frac{160}{6}=26.67geq^{-1}$