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Question: distance between the atoms in a crystal can be determined...

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Distance between the atoms in a crystal can be determined by examining the diffraction patterns produced in x-ray crystallography. For aluminum, the repeating unit of the crystal is a cube which has an edge length of 0.404 nm and contains four atoms of aluminum. Given the density of 2.70 g/cm3 for aluminum and that one mole of aluminum weighs 26.9815g, calculate the number of atoms in one mole of aluminum.

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