Chemistry

Palladium crystallizes with a face-centered cubic structure. It has a density of 12.0 g/cm^3, a radius of 138 pm, and a molar mass of 106.42 g/mol.

Use these data to estimate Avogadro's number.

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  1. The fcc has 4 atoms/unit cell.
    You know r, use that to calculate the edge of the unit cell, a.
    4r = a(2)1/2
    Then a3 = volume of the unit cell.
    mass of unit cell = volume x density.
    Then mass of unit cell is
    4 atoms x 106.24/N = mass
    Calculate N.

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  2. I got lost. :( I got:

    a=390

    ...and when I cubed that, I got a number that was too big so I figured that was wrong. What did I do wrong?

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