A-LevelChemistryChemical energetics9701/12 · May/June 2012 · Q121 Mark

Red lead oxide, Pb3O4, is used in metal priming paints. It can be made by heating PbO in air. 6PbO(s) + O2(g) → 2Pb3O4(s) Which two values are needed to calculate the enthalpy change for this reaction?

Aenthalpy change of atomisation of O2 and enthalpy change of formation of Pb3O4

Benthalpy change of formation of O2 and enthalpy change of formation of Pb3O4

Centhalpy change of formation of PbO and enthalpy change of atomisation of O2

Denthalpy change of formation of PbO and enthalpy change of formation of Pb3O4

✓ Correct answer

D: enthalpy change of formation of PbO and enthalpy change of formation of Pb3O4

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2012 Paper 1 Variant 2, question 12.

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