For the reaction H₂(g)+ I₂(g) 2HI(g), K_c = 50.2 at 445ºC. If [H₂] = [I₂] = [HI] = 1.75 * 10^-3 M at 445ºC, which one of these statements is true?

Question

Quizplus · Accepted Answer

Since the value of the equilibrium constant (K) is given, we can determine the direction of the reaction. If Q, the reaction quotient, is less than K, the reaction will proceed in the forward direction to reach equilibrium; if Q is greater than K, the reaction will proceed in the reverse direction. Given that the initial concentrations of all three species are equal, Q = [HI]2/[H₂][I₂] = (1.75 M)2/(1.75 M)2 = 1. Therefore, Q < K, and the reaction will proceed in the forward direction to reach equilibrium. Since HI is a product of the reaction, its concentration will increase as the system approaches equilibrium. Therefore, the correct answer is C.

For the Reaction H2(g)+ I2(g) 2HI(g), Kc = 50

For the Reaction H₂(g)+ I₂(g) 2HI(g), K_c = 50