Calculate the equilibrium number of vacancies per cubic meter for copper at 1000K. The energy for vacancy formation is 0.9eV/atom; the atomic weight and density at 1000K for copper are 63.5g/mol and 8.45g/cm3, respectively.

Therefore the equilibrium number of vacancies per unit cubic meter =2.34×10²⁴ vacancies/ mole

Explanation:

The equilibrium number of of vacancies is denoted by .

It is depends on

To find  equilibrium number of of vacancies we have find N.

Here ρ= 8.45 g/cm³  =8.45 ×10⁶m³

= Avogadro Number = 6.023×10²³

= 63.5 g/mole

    g/mole

Here =0.9 ev/atom , T= 1000k

Therefore the equilibrium number of vacancies per unit cubic meter,

   =2.34×10²⁴ vacancies/ mole

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metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.