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Sagot :
The total heat of hydration of 1. 00 mol of gas phase [tex]K^{+}[/tex] ions and [tex]Cl^{-}[/tex]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[tex]K^{+}[/tex] ions and [tex]Cl^{-}[/tex]– ions
Δ[tex]H_{solution}[/tex] = U° + Δ[tex]H_{hydration}[/tex]
Δ[tex]H_{hydration}[/tex] = Δ[tex]H_{solution}[/tex] - U° = 17. 2 kJ/mol - 701. 2 kJ/mol = - 684 kJ/mol
Hence, heat of hydration of 1. 00 mol of gas phase [tex]K^{+}[/tex] ions and [tex]Cl^{-}[/tex] ions is - 684 kJ/mol.
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