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r(Na^(+))" and " r(Cl^(-)) represent rad...

`r_(Na^(+))" and " r_(Cl^(-))` represent radius of `Na^(+)` and `Cl^(-)` ions respectively. If 'n' is the number of NaCl units per cell then give the eqution you will use to obtain molar volume.

Text Solution

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Edge length of unit cell 'a'`=2(r_(Na^(+))+r_(Cl^(-)))`
Volume of unit cell `=a^(3)=8(r_(Na^(+))+r_(Cl^(-)))^(3)`
Volume occupied by one mole of NaCl `=(8(r_(Na^(+))+r_(Cl^(-)))^(3))/(n)xxN_(A)`
Where `N_(A)=6.023xx10^(23)`
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