Platinum crystallizes with a face-centered cubic unit cell

Platinum crystallizes with a face-centered cubic unit cell. The radius of a platinum atom is 139 pm. Calculate the density of platinum.

I need help on this problem for my Chemistry quiz. I have no idea what the formula is. I only know these:

d= m/v and v=m/d. I also know the MW of platinum: 195.08 g

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Platinum crystallizes with a face-centered cubic unit cell : platinum crystallizes with a face-centered cubic unit cell. the radius of a platinum atom is 139 pm. calculate the

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