For the reaction below, the concentration of HI is 0.210 M and the concentrations of H₂, and I₂ are both 0.564 M. What must happen for the reaction to reach equilibrium? 2 HI (g) ⇌ H₂ (g) + I₂ (g) Kc = 7.21 For the reaction below, the concentration of HI is 0.210 M, and the concentrations of H₂ and I₂ are both 0.564 M. What must happen for the reaction to reach equilibrium?\[ 2 \text{HI (g)} \rightleftharpoons \text{H}_2 \text{(g)} + \text{I}_2 \text{(g)} \quad K_c = 7.21 \]A) The reaction needs to shift in the forward direction.B) The reaction needs to shift in the reverse direction.C) The reaction is already at equilibrium and no shift needs to take place.D) There is not enough information to determine how the reaction will reach equilibrium.The problem presents a chemical equilibrium scenario and asks which of the four statements (A, B, C, or D) correctly describes what must occur for the reaction to reach equilibrium.

Step1:To determine the behaviour ofthe reaction i.e the reactionneeds to shift in the forward, reverseor at equllibrium, reaction quotientshould be colculated.The relation between reaction quotientand equilibrium constant will tells thebehaviour of the reation.For the reaction,2HI(g)⇌H2(g)+I2(g),Kc=7.21reaction quotient (Q) is given by:Q=[H2][I2][HI]2] — (1)⇒If value of Q<Kc, thereaction shifts to the forwarddirection.⇒If value of Q=Kc, the reactionwill be at equilibrium.⇒If value of Q>Kc, the reactionwill be shifts to the reversedirection.Step 2:[HI]=0.210M[H2]=[I2]=0.564MNow using equation (1)Q=[H2][I2][HI]2=0.564×0.564(0.210)2Q=0.3180960.0441Q=7.21⇒Thus on calculation value of Q comesout be 7.21 which is equal toequilibrium constantKc.Q=Kc⇒Thus the reaction is already at equilibriumand no shift needs to take place.Therefore, option (C) is the correct answer.Conclusion: From the calculations of reaction quotient, it is found that the value of reaction quotient comes out equal to the equilibrium constant. Q = KC = 7.21 Which implies that the reaction is already at equilibrium and no shift needs to take place. Thus option (c) is the correct answer.