Radium is a Group 2 element.
The predicted lattice energy, ∆H°latt, of radium sulfide, RaS, is –2612kJ mol⁻¹.

Some data relating to radium and sulfur are listed. Select relevant data from this list for use in your answers to parts (b) to (e).

process value/kJ mol⁻¹
enthalpy change for Ra(s) → Ra²⁺(g) + 2e⁻ +1619
first ionisation energy of sulfur +1000
second ionisation energy of sulfur +2260
first electron affinity of sulfur -200
second electron affinity of sulfur +532
enthalpy change for S(s) + 2e⁻ → S²⁻(g) +555
lattice energy of RaS(s) -2612

Q: What topic does this question test?

This question tests Chemical energetics in A-Level Chemistry (syllabus code 9701). It is worth 13 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2021 examination, Paper 4 Variant 2 (9701_w21_qp_42.pdf).

Question

Radium is a Group 2 element.
The predicted lattice energy, ∆H°latt, of radium sulfide, RaS, is –2612kJ mol⁻¹.

Some data relating to radium and sulfur are listed. Select relevant data from this list for use in your answers to parts (b) to (e).

process	value/kJ mol⁻¹
enthalpy change for Ra(s) → Ra²⁺(g) + 2e⁻	+1619
first ionisation energy of sulfur	+1000
second ionisation energy of sulfur	+2260
first electron affinity of sulfur	-200
second electron affinity of sulfur	+532
enthalpy change for S(s) + 2e⁻ → S²⁻(g)	+555
lattice energy of RaS(s)	-2612

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