A-LevelChemistryChemical energetics9701/12 · May/June 2022 · Q11 Mark
Equations involving four enthalpy changes are shown. Na(g) → Na⁺(g) + e⁻ ΔH = W Na(g) → Na²⁺(g) + 2e⁻ ΔH = X Na(s) → Na(g) ΔH = Y Na(s) → Na²⁺(g) + 2e⁻ ΔH = Z Which equation represents the second ionisation energy of sodium?
AX
BX + Y - W
CX - W
DZ - W
✓ Correct answer
C: X - W
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