chemistry

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm3. What is the radius of the platinum atom?

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  1. The fcc has 4 atoms/unit cell.
    Mass of 1 atom Pt = 195.08/6.02 x 10^23.
    Mass of unit cell is 4 times that.
    Then m = volume x density. You know density and mass, calculate volume of unit cell. From volume = a3 you can calculate a (the length of the side).
    For a fcc unit cell, 4*radius = a*21/2. You know a and that allows you to calculate radius.
    Post your work if you get stuck.
    You know

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  2. 98

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  3. is not 98. try 139

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