Consider the Reaction: PCl 3 (G) + Cl₂ (G) PCl₅ (G) K

question 29

Multiple Choice

Consider the reaction:
PCl 3 (g) + Cl₂ (g) PCl₅ (g) K c = 4.2*10^{- 2}
A chemist charged a 1.00 liter reaction vessel with 0.125 moles of PCl₅ , 0.250 moles of Cl₂ and 0.375 moles of PCl 3 . If the equilibrium constant, K c , for this reaction is 4.2 10 - 2 , what is the reaction quotient, Q c , and what can be stated about the direction in which this reaction is occurring?

• A) Q _c = 0.75 and the reaction is proceeding from left to right as written.
• B) Q _c = 0.75 and the reaction is proceeding from right to left as written.
• C) Q _c = 0.75 and the reaction is at equilibrium.
• D) Q _c = 1.33 and the reaction is proceeding from left to right as written.
• E) Q _c = 1.33 and the reaction is proceeding from right to left as written.

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