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How can you determine the atoic mass of ...

How can you determine the atoic mass of an unknown metal if you know its density and the dimension of its unit cell ? Explain.

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`"Atomic mass of element (M)"=("Density"(rho)xx"Volume"(a^(3))xx"Avogadro's no."(N_(0)))/("No. of atoms in unit cell (Z)")`
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