For the equilibrium H₂(g)+ S(s)$\leftrightarrows$ H₂S(g),K_c = 6.1$\times$ 10⁵ at 298 K.If the concentrations of H₂ and H₂S are equal,which of the following statements is true?

Question

Quizplus · Accepted Answer

If the concentrations of H₂ and H₂S are equal, then the reaction quotient Qc would be [H₂S]/[S] = [H₂]/[S] = 1. Since the given equilibrium constant Kc = 6.1 x 10^10 is much greater than 1, and Qc = 1, the reaction will proceed in the forward direction to reach equilibrium, which means that the concentration of S would have to increase until Qc = Kc. Therefore, statement C is true: the reaction quotient equals 1.

For the Equilibrium H2(g)+ S(s) ⇆\leftrightarrows⇆ H2S(g),Kc = 6 ×\times× 105 at 298 K

For the Equilibrium H₂(g)+ S(s) $\leftrightarrows$ H₂S(g),K_c = 6 $\times$ 10⁵ at 298 K