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Hess' Law

Born - Haber ...

Question

Born - Haber cycle may be used

to find out electron affinity of non-metal atoms

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to find out lattice energy of the ionic compounds

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for the preparation of ammonia in industries

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both A and B

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Solution

The correct option is D both A and B
Born - Haber cycle is used to calculate the lattice energy for one mole of the ionic compound formed. According to this cycle, the value of lattice energy and enthalpy of formation is equal to the summation of sublimation energy of the metal atom, Ionization energy required for the formation of the cation, enthalpy of atomization and electron affinity.
From this formula, we can calculate any of the above values.

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M g B r_{2} (s)

=

=

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_{2}

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_{2}

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Δ

K H

{Δ H}_{a t o m i s a t i o n}

K = 90 k J / m o l

{Δ H}_{i o n i s a t i o n}

K = 418 k J / m o l

{Δ H}_{d i s s o c i a t i o n}

H = 436 k J / m o l

{Δ H}_{e l e c t r o n a f f i n i t y}

H = 78 k J / m o l

{Δ H}_{l a t t i c e}

K H = 710 k J / m o l

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