How do you calaculate lattice energy using Born Haber cycle?
Answer (1)
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 ΔH 1 = q 1
C → D ΔH 2 = q 2
D → B ΔH 3 = q 3
Then +Q = q 1 + q 2 + q 3 according to Hess' law. It should be emphasised that this law also applies to cyclic processes.
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