What would have been the partial pressure of NH₃, if excess solid NH₄HS had been taken in an evacuat — Chemical Equilibrium Chemistry Question

💡 Solution & Explanation

In an evacuated vessel, the only gases present come from the dissociation of NH₄HS. Thus, the partial pressures of NH₃ and H₂S will be equal. Let P_NH₃ = P_H₂S = x. Using the previously evaluated product of pressures (which acts as the equilibrium constant component): P_NH₃ × P_H₂S = 625 × 100 = 62500. So, x × x = 62500, which gives x² = 62500. Taking the square root, x = 250 mm. The partial pressure of NH₃ would be 250 mm. Therefore, correct answer is D.