1.

A metal X ( at. Mass = 60) has a bodycentred cubic crystal structure. The density of the metal is 4.2 g cm^(-3) . The volume of unit cell is

Answer»

`8.2 xx 10^(-23) cm^(3)`
`4.75 xx 10^(-23) cm^(3)`
`3.86 xx 10^(23) cm^(3)`
`3.86 xx 10^(-23) cm^(3)`

SOLUTION :MASS of unit cell `= ( 2 xx 60)/( 6.02 xx 10^(23))`
DENSITY `= ( " Mass")/( "VOLUME")`
`4.2 = ( 2XX 60)/( 6.02 xx 10^(23) xx v )`
or `V = ( 2 xx 60)/( 6.02 xx 10^(23) xx 4.2 )`
`= 4.75 xx 10^(-23) cm^(3)`


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