(A) Write thermodynamic equilibrium constant expressions for each of the following reactions. Relate these to K_c or K_p where appropriate.

(B) Write a thermodynamic equilibrium constant expression to represent the reaction of solid lead(II) sulfide with aqueous nitric acid to produce solid sulfur, a solution of lead(II) nitrate, and nitrogen monoxide gas. Base the expression on the balanced net ionic equation for the reaction.

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(a) Si(s) + 2 Cl2(g) SiCl4(g) (b) Cl₂(g) + H₂O(1) — HOCI(aq) + H*(aq) + Cl¯ (aq)