Question

Complete the following formulae
i) Volume of unit cell =
ii) mass of unit cell =
iii) Density of unit cell =

Answer 1

i) Volume of the unit cell = ( Edge length of the unit cell )³ Or

• a³ ( side )³
• Simply Calculated by the formula of volume.

ii) Mass of the unit cell = ( Sum of the masses of atoms , ions or molecules present in the unit cell ) Or

• No. of atoms or ( whatever present as points in unit cell ) x mass of an atom.
• no. of atoms x mass of an atom

iii) Density = Total mass of atoms inside the unit cell [ M ] (total) ÷ Volume of the unit cell V (a³)

• Simply Calculated from Density's formula.
• = Mass / Volume ( a³)