Calculate the energy for vacancy formation in silver, given that the equilibrium number of vacancies at 800˚c (1073 k) is 3.6 × 1023 m-3 . the atomic weight and density (at 800˚c) for silver are, respectively, 107.9 g/mol and 9.5 g/cm3 .

Answer : The energy for vacancy formation in silver is,

Explanation :

Formula used :

or,

So,

where,

= equilibrium number of vacancies =

E = energy = ?

M = atomic weight = 107.9 g/mole

= Avogadro's number =

= density =

T = temperature =

K = Boltzmann constant =

Now put all the given values in the above formula, we get:

Therefore, the energy for vacancy formation in silver is,

the volume increases

the answer is barium and copper bromide