Sodium crystallizes in a bcc unit cell. Calculate the approximate number of unit cells in 9.2 g of sodium. ( Atomic mass Na 23 u ) .

Explanation

No. of atoms per unit cell for bcc ( z) = 2
No. of atom is 9.2 g of Na `= ( 9.2g )/( 23g mol^(-1)) xx 6.022 xx 10^(23) ` atoms `mol^(-1)`
No. of Na atoms `= 2.4088 xx 10^(23)`
No. of unit cells `= ( 2.4088 xx 10^(23))/( "2 atoms unit "cel l^(-1)) `
`= 1.2044 xx 10^(23)`