1.

The pyknometric density of sodium chloride crystal is 2.165xx10^3 " kg m"^(-3) while its X-ray density is 2.178xx10^3 " kg m"^(-3) . The fraction of the unoccupied sites in sodium chloride crystal is

Answer»

5.96
`5.96xx10^(-2)`
`5.96xx10^(-1)`
`5.96xx10^(-3)`

Solution :MOLAR volume from pyknometric DENSITY =`M/(2.165xx10^3)m^3`
Molar volume from X-ray density `=M/(2.178xx10^3)m^3`
`THEREFORE` Volume unoccupied `=M/10^3(1/2.165-1/2.178)m^3=(0.013Mxx10^(-3))/(2.165xx2.178)`
`therefore` Fraction unoccupied `=((0.013Mxx10^(-3))/(2.165xx2.178))//((Mxx10^(-3))/2.165)=5.96xx10^(-3)`


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