The hydration energies of K+ and Cl– are –x and –y kJ/mol respectively. If lattice energy of KCl is –z kJ/mol, then the heat of solution of KCI is : (A) –z–(x + y) (B) x + y + z (C) z–(x + y) (D) +x –

Question

The hydration energies of K+ and Cl– are –x and –y kJ/mol respectively. If lattice energy of KCl is –z kJ/mol, then the heat of solution of KCI is :

(A) –z–(x + y)
(B) x + y + z
(C) z–(x + y)
(D) +x – y – z

Prashant Kotian · Accepted Answer

Correct answer: C. H sol. K+(g) KCl(s) + H2O L.E. H.E. K+(aq) + Cl–(aq) + Cl–(g) H.E. Hsol = L.E. + ) g ( K .) E . H (  + ) g ( Cl 1 – .) E . H ( = z – x – y = z – (x + y)

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