Each of the following properties shows a regular trend in Group 1A(1). Predict whether each increases or decreases up the group: (e) lattice energy of EBr.

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23-08-2022
Chemistry

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Each of the following properties shows a regular trend in Group 1A(1). Predict whether each increases or decreases up the group: (e) lattice energy of EBr.

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rafikiedu08 rafikiedu08 · Answer 1 · 2022-08-31T07:04:11-04:00

The correct answer is Down the group, lattice energy will decrease.

Since the anion is fixed, the lattice energy of EBr is inversely proportional to its bond length (r+ + r- is the sum of the radii of the cation and the anion). Since the overall bond length of EBr grows down the group as the cation radius decreases, the lattice energy will drop down the group in an inversely proportionate manner.

What is Lattice Enthalpy?

When all other factors stay constant, the production of one mole of an ionic compound from its gaseous ions results in a change in enthalpy known as lattice enthalpy. It is the amount of power needed to completely separate one mole of a gaseous ionic compound. We can even claim that Lattice Enthalpy is a gauge of an ionic compound's power.

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