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  4. What is the valency of an element of which the equivalent weight is 12 and the specific heat is 0.25 ?

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Q. What is the valency of an element of which the equivalent weight is $12$ and the specific heat is $0.25$ ?

Some Basic Concepts of Chemistry

Solution:

Specific heat $\times$ Atomic weight $=6.4$
(Dulong and Petit law)
Atomic weight $=\frac{6.4}{\text { specific heat }}=\frac{6.4}{0.25}$
Atomic weight $=E w \times$ valency $=25.6$
Valency $=\frac{\text { Atomic weight }}{E w}=\frac{25.6}{12}=2$
(Valency is always a whole number)