Thursday
March 23, 2017

Post a New Question

Posted by on Friday, January 29, 2010 at 7:40am.

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

  • chemistry - , Friday, January 29, 2010 at 1:46pm

    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

  • chemistry - , Thursday, February 11, 2010 at 10:32am

    98

  • chemistry - , Monday, February 28, 2011 at 8:10pm

    is not 98. try 139

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question