Calculate the number of Schottky defects per cubic meter in potassium chloride at $500C.$ The energy required to form each Schottky defect is $2\mathrm{.}6eV,$ whereas the density for at $500C)$ is $1\mathrm{.}955\frac{g}{c}{m}^3.$

$N_s=$Nexp$(-\frac{Q_s}{2kT})$

Qs: energ$$a requerida para la formaci$$n de un defecto Schottky.

$N$ : N$$mero total de sitios en la red

K: Boltzmann

T: temperatura