We examined the relationship of electrode potentials to thermodynamic data. In fact, electrode potentials can be calculated from tabulated thermodynamic data (many of which, in turn, were established from electrochemical measurements). To demonstrate this fact and to pursue further combine the three steps for the oxidation of Li(s) with a corresponding set of three steps for the reduction of H⁺ (1 M) to H₂(g) Obtain Δ_rH° for the overall reaction.

(a) Neglect entropy changes that occur (that is, assume that Δ_rG° ≈ Δ_rH°), and estimate the value of E°_Li+/Li.

(b) Combine the calculated Δ_rH° value with a value of Δ_rS° to obtain another estimate of E°_Li+/Li. Hydration energies for Li⁺(g) and H⁺(g) to form 1 M solutions are –522 and –1094 kJ mol^–1, respectively. Also, use data from various locations in this text.