Calculate the number of vacancies per cubic meter for some metal, $M,$ at $737C.$ The energy for vacancy formation is $0\mathrm{.}94e\frac{V}{a}$tom,

while the density and atomic weight for this metal are $6\mathrm{.}95\frac{g}{c}{m}^3($at $737C)$ and $48\mathrm{.}16\frac{g}{m}ol,$ respectively.

$m^{-3}$