Calcium chloride, CaCl₂, is an ionic solid.
The values of some energy changes are shown in Table 1.1.
Table 1.1
energy change | value/kJ mol⁻¹
lattice energy, ∆H°latt, CaCl₂(s) | -2237
standard enthalpy change of atomisation of calcium | +193
first ionisation energy of calcium | +590
second ionisation energy of calcium | +1150
standard enthalpy change of atomisation of chlorine | +121
first electron affinity of chlorine | -364

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 2 (9701_w22_qp_42.pdf).

Question

Calcium chloride, CaCl₂, is an ionic solid.
The values of some energy changes are shown in Table 1.1.
Table 1.1
energy change | value/kJ mol⁻¹
lattice energy, ∆H°latt, CaCl₂(s) | -2237
standard enthalpy change of atomisation of calcium | +193
first ionisation energy of calcium | +590
second ionisation energy of calcium | +1150
standard enthalpy change of atomisation of chlorine | +121
first electron affinity of chlorine | -364

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