The total heat of hydration of 1. 00 mol of gas phase 
ions and 
ions is - 684 kJ/mol.
Calculation ,
Given data ,
Heat of solution = 17. 2 kJ/mol
lattice energy of KCl(s) = 701. 2 kJ/mol.
heat of hydration = ?
The KCl is formed by ions and – ions
Δ
= U° + Δ
Δ = Δ - U° = 17. 2 kJ/mol - 701. 2 kJ/mol = - 684 kJ/mol
Hence, heat of hydration of 1. 00 mol of gas phase ions and ions is - 684 kJ/mol.
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Answer:
Subtracting the number of protons from the atomic mass.
Noble gas configuration for Li : [He]2s¹
<h3>Further explanation
</h3>
In an atom, there are levels of energy in the shell and sub-shell
This energy level is expressed in the form of electron configurations.
Lithium with atomic number 3, then the electron configuration:
1s²2s¹
And for noble gas configuration or it can be called Condensed electron configurations :
[He]2s¹
So the atomic number is the same as protons, and electrons and to get neutrons by subtracting number of protons from atomic mass.
