Spontaneous Reaction Video Lessons

Concept

# Problem: Among the many complex ions of cobalt are the following:Co(NH3)63+(aq) + 3en(aq) ⇌ Co(en)33+(aq) + 6NH3(aq)where “en” stands for ethylenediamine, H2NCH2CH2NH2. Six Co—N bonds are broken and six Co—N bonds are formed in this reaction, so ΔH°rxn ≈ 0; yet K &gt; 1. What are the signs of ΔS° and ΔG°?

###### FREE Expert Solution

Recall that ΔG˚rxn and K are related to each other:

$\overline{){\mathbf{\Delta G}}{{\mathbf{°}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{-}}{\mathbf{RTlnK}}}$

We’re given that K > 1:

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###### Problem Details

Among the many complex ions of cobalt are the following:

Co(NH3)63+(aq) + 3en(aq) ⇌ Co(en)33+(aq) + 6NH3(aq)

where “en” stands for ethylenediamine, H2NCH2CH2NH2. Six Co—N bonds are broken and six Co—N bonds are formed in this reaction, so ΔH°rxn ≈ 0; yet K > 1. What are the signs of ΔS° and ΔG°?