Advertisements
Advertisements
Question
What is lattice energy?
Solution
Lattice energy is defined as the amount of energy required to completely remove the constituent ions from its crystal lattice to an infinite distance. It is also referred as lattice enthalpy.
APPEARS IN
RELATED QUESTIONS
The bond dissociation energy of methane and ethane are 360 kJ mol–1 and 620 kJ mol–1 respectively. Then, the bond dissociation energy of the C-C bond is
Write down the Born-Haber cycle for the formation of CaCl2
Suggest and explain an indirect method to calculate lattice enthalpy of sodium chloride crystal.
Calculate the lattice energy of CaCl2 from the given data
\[\ce{Ca_{(s)} + Cl2_{(g)} -> CaCl2_{(s)}}\] ∆`"H"_"f"^0` = − 795 kJ mol−1
Sublimation: \[\ce{Ca_{(s)} -> Ca-{(g)}}\] ∆`"H"_1^0` = + 121 kJ mol−1
Ionisation: \[\ce{Ca_{(g)} -> Ca^2+_{(g)} + 2e^-}\] ∆`"H"_2^0` = + 2422 kJ mol−1
Dissociation: \[\ce{Cl2_{(g)} -> 2Cl_{(g)}}\] ∆`"H"_3^0` = + 242.8 kJ mol−1
Electron affinity: \[\ce{Cl_{(g)} + e^- -> Cl^-_{(g)}}\] ∆`"H"_4^0` = −355 kJ mol−1
