Question

Lithium has a BCC structure its density is 530 kg per metre cube and its atomic mass is 6.94 gram per mole calculate the age length of unit cell of lithium metal​

Answer 1

Answer:

The length of unit cell of Li metal will be 352 pm.

Explanation:

The density of BCC = 530 kg m^-3

$d =  \frac{ zM }{a^{3}N_{o}}$

d = density of crystal

z = number of effective constituent particles in one unit cell

M = molar mass

a = edge length of a unit cell

No = 6.022 x 10^23

$[\frac{zM}{dN_{o} } ]^{1/3}$

a = [ 2 x 6.94 / 0.530x 6.022 x10^23 ] ^ 1/3

$[ \frac{2 * 6.94}{0.530 * 6.022 * 10^{23} } ]^{1/3}$

a = $3.52 * 10^{-10}$ m

a = 352 pm

Answer 2

Answer:352 pm

Explanation:use formula

d= M × Z / Na × a^3

a =( M × Z / Na × d )^1/3