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How do you calaculate lattice energy using Born Haber cycle?


Kamendra kumar 18th Nov, 2021
Answer (1)
Kamendra kumar 18th Nov, 2021

Hess' law of constant heat of summation underpins the Born-Haber cycle. According to Hess' rules, whether a chemical reaction occurs in one or more steps, the overall heat of the reaction remains constant. For example, the heat of reaction (H) = +Q for a chemical reaction given by

 


A → B.



Alternatively, if the reaction occurs in multiple steps:



A → C ΔH1 = q1



C → D ΔH2 = q2



D → B ΔH3 = q3



Then +Q = q+ q2 + q3 according to Hess' law. It should be emphasised that this law also applies to cyclic processes.

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