Answers: 1
:
for the Avogadro number, thus:
and 
, thus:![V_C=6c(a/2)^2\sqrt{3}\\V_C=6a*1.58(a/2)^2\sqrt{3}\\V_C=16.4a^3/4\\a=\sqrt[3]{\frac{4*1.058x10^{-28}\frac{m^3}{UnitCell}}{16.4} } \\a=2.96x10^{-10}m\\c=1.58a\\c=1.58*2.96x10^{-10}m\\c=4.67x10^{-10}m](/tpl/images/0081/7540/a224e.png)
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