Consder the following equilibrum  PCl3 (g) + Cl2 (g) ↔ PCl5 (g) ΔrH°=-92 kJ/mol The concentration of PCl3 at equilibrium may be increased by     adding a catalyst     increasing the pressure through decreasing the volume     adding PCl5 to the system     decreasing the temperature     adding Cl2 to the system

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