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14 September, 00:24

Which value would be required to estimate the lattice energy for the hypothetical ionic compound MgH2?

A the electron affinity

B the first ionisation energy

C the magnesium-hydrogen bond energy

D the standard enthalpy change of formation of MgH2

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  1. 14 September, 03:36
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    D, the energy of formation is equal to the dissociation. so from magnesium ions and Hydrogen ions, when they form the lattice energy is equal to formation-dissociation, as they aren't going to dissociate (fixed in lattice) the formation should be the same as the the overall lattice energy.
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