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Cl(g) ΔH°f, = +121.3 kJ mol–1

Cl–(aq) ΔH°f, = –167.2 kJ mol–1

HCl(g) ΔH°f, = –92.3 kJ mol–1

HCl(aq) ΔH°f, = –167.2 kJ mol–1

Cl2(g) ΔH°f, = 0 kJ mol–1

H2O(l) ΔH°f, = –286 kJ mol–1

ClO2(g) ΔH°f, = +102.5 kJ mol–1

Cl2O(g) ΔH°f, = +80.3 kJ mol–1

O(g) ΔH°f, =+249.0 kJ mol–1

H(g) ΔH°f, =+218.2 kJ mol–1

Which material is most 'stable' at 298 K?



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