The pyknometric density of sodium chloride crystals is2.165 xx 10^(3) kg m^(-3)while X -ray density is2.178 xx 10^(3)kg m^(-3) . Thefraction of the unoccupied sites in sodium chloride crystal is

The pyknometric density of sodium chloride crystals is2.165 xx 10^(3)

1.	The pyknometric density of sodium chloride crystals is2.165 xx 10^(3) kg m^(-3)while X -ray density is2.178 xx 10^(3)kg m^(-3) . Thefraction of the unoccupied sites in sodium chloride crystal is
Answer» 5.96 `5.96 xx 10^(-2)` `5.96 xx 10^(-1)` ` 5.96 xx 10^(-3)` Solution :MOLAR VOLUME from pyknometric density ` = M/(2.165 xx 10^(3)) m^(3)` Molar volume from X-ray density ` M/(2.178 xx 10^(3)) m^(3)` Volume unoccpied `M/10^(3) ( 1/(2.165) - 1/(2.178))m^(3) = (( 0.013 M xx10^(-3))/(2.165 xx 2.178))//((M xx 10^(-3))/2.165) = 5.96 xx 10^(-3)`