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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Priyanshu kumar
There are 5 enthalpy associated here...3 of them include endothermic steps means heat is absorbed and 2 of them include exothermic steps means heat is released
For enthalpy of formation to be negative del Hf ...the exothermic steps must be less than endothermic steps...so overall it becomes negative
Enthalpy of sublimation requires heat...so it is endothermic
Ionisation enthalpy you know it is energy required to remove the most loosely bound electrons..so it is also endothermic
For dissociation we require heat...so it is also endothermic
electron affinity is energy released...so exothermic
lattice energy is heat released..so exothermic...
So for stable ionic compounds...exothermic steps must be less than endothermic steps...for del Hf to be negative
Now got this simun??
please ask if any doubt😊🙏
what is born land equation and its use
for lattice energy calculation of ionic compound...born lande equation is used
what is born land equation
see this
it is just a equation for calculation of lattice energy of ionic compounds
but in exam which is use born hebar or born land
born haber cycle also you prefer for more precise enthalpy
according to question you proceed...
ok sir tq
you welcome simun😊