Question

For metals, specific heat $\times$ atomic weight $=1.6$ $\times$ $A$. What is the value of $A$?

Answer 1

According to Dulong and Petit's law for metals, the relationship between the specific heat and atomic weight is Specific heat $\times$ atomic weight $=6.4$.

But according to the question, Specific heat $\times$ atomic weight $=1.6\times A$.
Hence, $6.4=1.6\times A$
$A=\frac{6.4}{1.6}=4$