Ammonia at a pressure of 10 atm and CO₂ at a pressure of 20 atm are introduced into an evacuated chamber. If K_p for the reaction: NH₂COONH₄(s) ⇌ 2NH₃(g) + CO₂(g) is 2020 atm³, the total pressure afte

Question

Ammonia at a pressure of 10 atm and CO₂ at a pressure of 20 atm are introduced into an evacuated chamber. If K_p for the reaction: NH₂COONH₄(s) ⇌ 2NH₃(g) + CO₂(g) is 2020 atm³, the total pressure after a long time is

Prashant Kotian · Accepted Answer

Correct answer: C. The initial reaction quotient is Q_p = (P_NH₃)²(P_CO₂) = (10)²(20) = 2000 atm³. Since Q_p (2000) < K_p (2020), the reaction tends to move in the forward direction. However, there is no solid NH₂COONH₄ initially present to decompose. Thus, no forward reaction can occur, and the pressures remain unchanged. Total pressure = 10 + 20 = 30 atm. Therefore, correct answer is C.

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