The product of specific heat of pure element and atomic mass of the element is equal to 6.4.
i.e. Atomic mass × specific heat = 6.4 (approx)
Note:
This law is not applicable to lighter element like boron, carbon, silicon. To obtain correct atomic mass of element first of all equivalent mass of the element is known by any other method and their atomic mass = eq. weight × valency
In which valency has whole number value which can be deduced by dividing approximate by equivalent mass.
*Dulongs and Petit’ Law:**
Atomic Mass x Specific Heat 6.4 (in cal/gm)
