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Calculate the lattice energy of sodium c...

Calculate the lattice energy of sodium chloride crystal from the following data: Born exponent, n=8, Madelung constant for NaCl=1.748, Ionic radius of `Na^(+)=0.95 Å`, Ionic radius of `Cl^(-)=1.81Å`.

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`r_(0) = 0.95Å +1.81Å= 2.76Å= 2.76.10^(-10)` m
According to Born Lande’s equation, lattice enthalpy, `Delta_("lattice") H=1.39xx10^5(Z^(+)Z^(-)A)/(r_(0))(1-1/n)`
=`-1.39xx10^5 N m^2 mol^(-1)(1xx1xx1.748)/(2.76xx10^(-10) m)(1-1/8) = -770 kJ mol^(-1)`
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