Answer to Question #286888 in Chemistry for michelle

Question

At 60°C, the reaction, PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) has a K value of12.5. If the reaction quotient, Q, calculated from initial concentrations is 19.8 at 60°C, which of the following statements is correct?

1. the rate of the reverse reaction is equal to the rate of forward reaction
2. there is more reactant concentration than product concentration
3. the system is already at equilibrium
4. system must shift to the right to reach equilibrium
5. system must shift to the left to reach equilibrium

Answer 1

Question:

At 60°C, the reaction, PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) has a K value of12.5. If the reaction quotient, Q, calculated from initial concentrations is 19.8 at 60°C, which of the following statements is correct?

1. the rate of the reverse reaction is equal to the rate of forward reaction
2. there is more reactant concentration than product concentration
3. the system is already at equilibrium
4. system must shift to the right to reach equilibrium
5. system must shift to the left to reach equilibrium

Answer: 5. system must shift to the left to reach equilibrium, as the reaction quotient Q is higher than the equilibrium constant K.