Potassium chloride, KCl, and magnesium chloride, MgCl₂, are both ionic solids.

Table 1.1
energy change value/kJ mol⁻¹
standard enthalpy change of solution, ΔH°sol, of KCI +15
lattice energy, ΔH°latt, of KCl(s) -701
standard enthalpy change of hydration, ΔH°hyd, of K⁺ -322
standard enthalpy change of hydration, ΔH°hyd, of Cl⁻ -364
standard enthalpy change of solution, ΔH°sol, of MgCl₂ -155
lattice energy, ΔH°latt, of MgCl₂(s) -2493

Q: What topic does this question test?

This question tests Chemical energetics in A-Level Chemistry (syllabus code 9701). It is worth 11 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2022 examination, Paper 4 Variant 3 (9701_w22_qp_43.pdf).

Question

Potassium chloride, KCl, and magnesium chloride, MgCl₂, are both ionic solids.

Table 1.1
energy change                                          value/kJ mol⁻¹
standard enthalpy change of solution, ΔH°sol, of KCI        +15
lattice energy, ΔH°latt, of KCl(s)                          -701
standard enthalpy change of hydration, ΔH°hyd, of K⁺        -322
standard enthalpy change of hydration, ΔH°hyd, of Cl⁻       -364
standard enthalpy change of solution, ΔH°sol, of MgCl₂      -155
lattice energy, ΔH°latt, of MgCl₂(s)                        -2493

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