. Determine the standard free energy change, ɔ(G p for the formation of S2−(aq) given that the ɔ(G p for Ag+(aq) and Ag2S(s) are 77.1 k/mole and −39.5 kJ/mole respectively, and the solubility product for Ag2S(s) is 8 10−51.

The standard free energy change of formation of is 92.094 kJ/mol

Explanation:

We are given:

Relation between standard Gibbs free energy and equilibrium constant follows:

where,

= standard Gibbs free energy = ?

R = Gas constant =

T = temperature =

K = equilibrium constant or solubility product =

Putting values in above equation, we get:

For the given chemical equation:

The equation used to calculate Gibbs free change is of a reaction is:  

The equation for the Gibbs free energy change of the above reaction is:

We are given:

Putting values in above equation, we get:

Hence, the standard free energy change of formation of is 92.094 kJ/mol

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