The Reaction Quotient Video Lessons

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Problem: For the reaction 2HI(g) ⇌ H2(g) + I2(g), Kc = 0.290 at 400 K. If the initial concentrations of HI, H2, and I2 are all 1.50 × 10–3 M at 400 K, which one of the following statements is correct?A) The concentrations of HI and I2 will increase as the system is approaching equilibrium.B) The concentrations of H2 and I2 will increase as the system is approaching equilibrium.C) The system is at equilibrium.D) The concentrations of H2 and HI will decrease as the system is approaching equilibrium.E) The concentration of HI will increase as the system is approaching equilibrium.

FREE Expert Solution

We are being asked what would be the reaction condition of the given reaction mixture given the concentrations of the reactants and product. We will use the reaction quotient, Q, to determine if a chemical reaction would be at equilibrium or not. The formula for Q is:


Q = productsreactants


Depending on if Q is greater than or less than K our reaction will shift to attain equilibrium by reaching the equilibrium constant K:


If Q = K           → the reaction is at equilibrium

If Q < K           → the reaction shifts in the forward direction to reach equilibrium

If Q > K           → the reaction shifts in the reverse direction to reach equilibrium


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Problem Details

For the reaction 2HI(g) ⇌ H2(g) + I2(g), Kc = 0.290 at 400 K. If the initial concentrations of HI, H2, and I2 are all 1.50 × 10–3 M at 400 K, which one of the following statements is correct?

A) The concentrations of HI and I2 will increase as the system is approaching equilibrium.

B) The concentrations of H2 and I2 will increase as the system is approaching equilibrium.

C) The system is at equilibrium.

D) The concentrations of H2 and HI will decrease as the system is approaching equilibrium.

E) The concentration of HI will increase as the system is approaching equilibrium.

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