UNIT CELLS CALCULATIONS

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

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2. Calculate the crystallographic radius of Vanadium atoms if the metal has a density of 6.11 g/cm 3 and is known to have a body centred cubic unit cell. Solution In general; l l l atom per mass atoms # olume v mass d × × × = = For bcc unit cell; 3 l N mol 1 MW atom 2 d A V × × = and, 3 4 r l × = So, 3 3 4 × × = r N mol 1 MW atom 2 d A V Rearranging to solve for r yields; () d N mol 1 MW atoms 2 r 3 64 A V 3 × × = 3 and
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/12/2011 for the course CHEM CHEM 2B taught by Professor Cabrera during the Spring '09 term at San Jose City College.

Page1 / 4

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online