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UNIT CELLS CALCULATIONS - Example Unit Cell Calculations 1...

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Example Unit Cell Calculations 1. Calculate the density of Platinium metal if it has a face centred cubic unit cell and a crystallographic radius of 135 pm. Solution In general; l l l atom per mass atoms # olume v mass d × × × = = For fcc unit cell; 3 l N mol 1 MW atoms 4 d A Pt × × = and, r 2 2 l × = So, ( ) 3 2 2 r N mol 1 MW atoms 4 d A Pt × × × = ( ) 3 23 21 3 10 10 567 . 5 10 296 . 1 10 135 2 2 cm g cm atoms 10 6.02 mol 1 g/mol 195.1 atoms 4 d 23 × × = × × × × × = So d = 23.3 g/cm 3 Unit Cell Solutions.doc
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