A-LevelChemistryChemical energetics9701/12 · May/June 2013 · Q21 Mark

Equations involving four enthalpy changes are shown. Na(g) → Na⁺(g) + e⁻ ΔΗ = W Na(g) → Na²⁺(g) + 2e⁻ ΔΗ = X Na(s) → Na(g) ΔΗ = Y Na(s) → Na²⁺(g) + 2e⁻ ΔΗ = Z What is the second ionisation energy of sodium?

BX - W

CY - W

DZ - Y

✓ Correct answer

B: X - W

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2013 Paper 1 Variant 2, question 2.

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