Consider the reaction . The equilibrium constant is . If pure ammonia is left to dissociate, the partial pressure of ammonia at equilibrium is given by (Assume at equilibrium)

Question

Consider the reaction . The equilibrium constant is . If pure ammonia is left to dissociate, the partial pressure of ammonia at equilibrium is given by (Assume  at equilibrium)

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Step 1 — Reverse reaction (dissociation of ):

Step 2 — Let  (small), total pressure :
From stoichiometry: ,  (since )

Step 3 — Write  for forward reaction:

Step 4 — Solve for p:

Answer: Option (1)

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