What is the equilibrium number of vacancies per cubic meter for copper at $477$C$?$ The energy of vacancy formation is $0\mathrm{.}9$ eV$/$atom$.$ The atomic weight and density are $63\mathrm{.}5$g$/$mol and $8\mathrm{.}4$g$/$cm$3.$

Group of answer choices

$8\mathrm{.}25$x$10^25$

$7\mathrm{.}17$x$10^22$

$3\mathrm{.}59$x$10^22$

$6\mathrm{.}82$x$10^16$