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You are given a small bar of an unknown metal, X. You find the density of the metal to be 11.7 g/cm3. An X-ray diffraction experiment measures the edge of the unit cell as 5.12 angstroms. Assuming the metal crystallizes in a face-centered cubic lattice, what is the atomic weight of X in g/mole? (1 angstrom = 1 x 10^-8 cm)

  • chemistry - ,

    edge unit cell = 5.12E-8 cm
    volume unit cell = edge^3
    mass unit cell = volume x density = ?
    Substitute into
    ? mass = 4atoms/unit cell x atomic mass/6.022E23
    Solve for atomic mass.

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