Complete Question
The complete question is shown on the first uploaded image Â
Answer:
The density is  [tex]\rho = 8.21479 g/cm^3[/tex]
Explanation:
From the question we are told that
     the lattice constant is  [tex]a = 0.295 nm = 0.295*10^{-9} = 0.295*10^{-7} cm[/tex]
The density of Copper ([tex]\beta[/tex]) is mathematically represented as
   [tex]\rho = \frac{ZM}{a^3N_A}[/tex]
Where  Z is the number of units in a unit cell and  for BCC crystals  Z =2
     M is the molar mass of copper which same for Copper with a value of Â
      [tex]M = 63.5 g/mol[/tex]
     [tex]N_A[/tex] is the Avogadro's constant with a value of  [tex]N_A = 6.022*10^{23}[/tex]
Substituting values
    [tex]\rho = \frac{2 *63.5}{(0.295*10^{-7})^3 * (6.022*10^{23})}[/tex]
   [tex]\rho = 8.21479 g/cm^3[/tex]
   Â
