When vapors from hydrochloric acid and aqueous ammonia come in contact, they react, producing a white cloud of solid NH 4 Cl (Figure 18 9) HCl(g) NH 3 (g) NH 4 Cl(s) Defining the reactants and products as the system under study (a) Predict whether S(system), S(surroundings), S(universe), r H, and r...

The Answer is in the image, click to view ...

When vapors from hydrochloric acid and aqueous ammonia come in contact, they react, producing a white cloud

Question:

When vapors from hydrochloric acid and aqueous ammonia come in contact, they react, producing a white “cloud” of solid NH₄Cl (Figure 18.9).

HCl(g) + NH₃(g) ⇄ NH₄Cl(s)
Defining the reactants and products as the system under study:
(a) Predict whether ΔS°(system), ΔS°(surroundings), ΔS°(universe), Δ_r H°, and Δ_rG° (at 298 K) are greater than zero, equal to zero, or less than zero; and explain your prediction. Verify your predictions by calculating values for each of these quantities.
(b) Calculate the value of K_p for this reaction at 298 K.

Data given in figure 18.9