Calcium carbonate decomposes on heating.
CaCO3(s) → CaO(s) + CO2(g)
Table 4.1 shows the values of the Gibbs free energy change, AG°, for this reaction at various
temperatures.
[Figure Table 4.1]
Assume the standard enthalpy change, ∆Η°, and the standard entropy change, AS, for this
reaction remain constant over this temperature range.

Q: What topic does this question test?

This question tests Chemical energetics in A-Level Chemistry (syllabus code 9701). It is worth 14 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry May/June 2022 examination, Paper 4 Variant 2 (9701_s22_qp_42.pdf).

Question

Calcium carbonate decomposes on heating.
CaCO3(s) → CaO(s) + CO2(g)
Table 4.1 shows the values of the Gibbs free energy change, AG°, for this reaction at various
temperatures.
[Figure Table 4.1]
Assume the standard enthalpy change, ∆Η°, and the standard entropy change, AS, for this
reaction remain constant over this temperature range.

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