Chapter 12 The Solid State - 12-7 Phase Diagrams - Applying Chemical Principles - Questions - Page 466: 3

649 pm on each side.

Mass: $8\times 118.71\ g/mol\div 6.022\times 10^{23}\ atoms/mol=1.577\times10^{-21}\ g/cell$ Volume: $1.577\times10^{-21}\ g/cell\div5.769\ g/cm^3=2.734\times10^{-22}cm^3/cell$ Side length: $\sqrt[3]{2.734\times10^{-22}cm^3}=6.49\times10^{-8}\ cm=649\ pm$