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What is the distance between Na^+ and Cl...

What is the distance between `Na^+` and `Cl^-` ions in NaCl crystal if the density is `2.165 g cm^-3`. `Molar mass of NaCl=58.5 g mol^-1`, (`N_A=6.02xx10^23 mol^-1)`.

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MODERN PUBLICATION-SOLID STATE-EXERCISE
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