1.

Lithium metal has a body centred cubic structure. Its density is 0.53g cm^(-3) and its molar mass is 6.94g mol^(-1). Calculate the volume of a unit cell of lithium metal.

Answer»

SOLUTION :For bcc unit CELL, Z=2
DENSITY (d)=0.53 G `cm^(-3)`
Molar mass, M=6.94 g `mol^(-1)`
Mass of an atom = `(6.94)/(6.023 xx 10^(23)) = 1.152 xx 10^(-23)g`
Mass of unit cell = `2 xx 1.152 xx 10^(-23) = 2.304 xx 10^(-23) g`
Volume of unit cell = `("Mass")/("Density")=(2.304 xx 10^(-23))/(0.53) cm^3`
`= 4.35 xx 10^(-23) cm^3`


Discussion

No Comment Found

Related InterviewSolutions