Concept explainers
Formation constants for the ammonia and ethylenediamine complexes of nickel(II) indicate that Ni(en)32+ is much more stable than Ni(NH3)62+:
(1)
(2)
The enthalpy changes for the two reactions, ΔH°1 and Δ H°2, should be about the same because both complexes have six Ni – N bonds.
- (a) Which of the two reactions should have the larger entropy change, ΔS°? Explain.
- (b) Account for the greater stability of Ni(en)32+ in terms of the relative values of ΔS° for the two reactions.
- (c) Assuming that ΔH°2 – ΔH°1 is zero, calculate the value of ΔS°2 – ΔS°1
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General Chemistry: Atoms First
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