The lattice energy of NaCl is -780 , kJ , mol | vedclass

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(B) The enthalpy of solution $(\Delta H_{sol})$ is calculated using the Born-Haber cycle approach,where $\Delta H_{sol} = \Delta H_{lattice} + \Delta

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(B) The enthalpy of solution $(\Delta H_{sol})$ is calculated using the Born-Haber cycle approach,where $\Delta H_{sol} = \Delta H_{lattice} + \Delta H_{hyd(Na^+)} + \Delta H_{hyd(Cl^-)}$.
Step $1$: The lattice energy is given as $-780 \, kJ \, mol^{-1}$ (energy released during formation). The lattice enthalpy $(\Delta H_{lattice})$ is the energy required to break the lattice,which is the negative of the lattice energy: $\Delta H_{lattice} = -(-780 \, kJ \, mol^{-1}) = 780 \, kJ \, mol^{-1}$.
Step $2$: The hydration enthalpies are $\Delta H_{hyd(Na^+)} = -406 \, kJ \, mol^{-1}$ and $\Delta H_{hyd(Cl^-)} = -364 \, kJ \, mol^{-1}$.
Step $3$: Calculate the enthalpy of solution:
$\Delta H_{sol} = 780 \, kJ \, mol^{-1} + (-406 \, kJ \, mol^{-1}) + (-364 \, kJ \, mol^{-1})$
$\Delta H_{sol} = 780 - 770 = 10 \, kJ \, mol^{-1}$.

$(I)$	Dipole moment	$NF_3 > NH_3 > BF_3$
$(II)$	Covalent bond length	$C-O > N-O > O-H$
$(III)$	Bond order	$C_2 > B_2 > He_2$

The lattice energy of $NaCl$ is $-780 \, kJ \, mol^{-1}$. The enthalpies of hydration of $Na^{+}_{(g)}$ and $Cl^{-}_{(g)}$ ions are $-406 \, kJ \, mol^{-1}$ and $-364 \, kJ \, mol^{-1}$ respectively. The enthalpy of solution of $NaCl_{(s)}$ is $..... \, kJ \, mol^{-1}$.

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$(I)$ Dipole moment $NF_3 > NH_3 > BF_3$
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$(III)$ Bond order $C_2 > B_2 > He_2$

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