Calculate the number of vacancies per cubic meter for some metal, M, at 723°C. The energy for vacancy formation is 0.89 eV/atom, while the density and atomic weight for this metal are 5.49 g/cm3 (at 723°C) and 50.02 g/mol, respectively.

Explanation:

The number of vacancies per cubic meter are calculated as follows.

                      =

Putting the given values into the above formula as follows.

               =

               =

               =

               = 4.706

Thus, we can conclude that number of vacancies per cubic meter for some metal, M, is 4.706 .