4.0 moles of argon and 5.0 moles of are introduced into an evacuated flask of 100 litre capacity at 610 K. The system is allowed to equilibrate. At equilibrium, the total pressure of mixture was foun

Question

4.0 moles of argon and 5.0 moles of  are introduced into an evacuated flask of 100 litre capacity at 610 K. The system is allowed to equilibrate. At equilibrium, the total pressure of mixture was found to be 6.0 atm. The  for the reaction is:

Canvas Classes · Accepted Answer

Step 1 — Total moles at equilibrium:

Step 2 — Moles of PCl₅ system:
Argon = 4 mol (inert)  PCl₅ system moles =  mol

Reaction:

Let  = moles dissociated:
- PCl₅: , PCl₃: , Cl₂:   total =

Step 3 — Partial pressures:

Step 4 — :

Answer: Option (1) — 2.25

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