The packing fraction for zinc is 0.62. In the hexagonal close packed system (HCP) there are 2 atoms per cell. Hence, the density is
"\\rho=\\frac{M}{V}=\\\\\n\\space\\\\\n=\\frac{2\\cdot0.62\\cdot65.37\\cdot1.66054\\cdot10^{-27}}{(2.66\\cdot10^{-10})^3}=7152\\text{ kg\/m}^3."
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