Metals react with hydrogen halides (such as HCl) to give the metal halide and hydrogen:

The free energy change for the reaction is Δ_rG° = Δ_fG°(MX_n) − n Δ_fG°[HX(g)].
(a) Δ_fG° for HCl(g) is −95.1 kJ/mol. What must be the value for Δ_fG° for MX_n for the reaction to be product-favored at equilibrium?
(b) Which of the following metals is (are) predicted to have product-favored reactions with HCl(g): Ba, Pb, Hg, Ti?

Transcribed Image Text:

M(s) + n HX(g) → MX,(s) + 2 H₂(g)