A-LevelChemistryChemical energetics9701/12 · May/June 2011 · Q71 Mark

Titanium occurs naturally as the mineral rutile, TiO2. One possible method of extraction of titanium is to reduce the rutile by heating with carbon. TiO2(s) + 2C(s) → Ti(s) + 2CO(g) The standard enthalpy changes of formation of TiO2(s) and CO(g) are –940 kJ mol⁻¹ and -110 kJ mol⁻¹ respectively. What is the standard enthalpy change of this reaction?

A-830 kJ mol⁻¹

B-720 kJ mol⁻¹

C+720 kJ mol⁻¹

D+830 kJ mol⁻¹

✓ Correct answer

C: +720 kJ mol⁻¹

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2011 Paper 1 Variant 2, question 7.

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