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 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.

Based on the information below, calculate the equilibrium concentration of B (g). 4A (g) + B (g) ----> 2C(g)        Kc=5x10-24 Initial concentration of A= 0.10 M Initial concentration of B=0.34 M Initial concentration of C=0.80 M

5) For the reaction shown below, at a particular time, the following concentrations are obtained: [CO] = 0.034 M, [CO2] = 3.6 x 10-17 M. Is this reaction at equilibrium? If not, which direction will the reaction proceed and what will the concentrations be at equilibrium? 2 CO (g) « C (s) + CO2 (g)​​​Kc = 7.7 x 10-15

4. Given the reaction: 3X(g) + Y(g) ↔ 2 Z(g) + W(g)Which of the following is true?a. Kc > Kpb. Kc < Kpc. Kc = Kp5. For the reaction: 2 X(s) + 3 Y(g) ↔ 2 Z(s) Kc = ???At equilibrium, the system contains [Y] = 0.0025 M. The amounts of [X(s)] = 100 mol/Land [Z(s)] = 395 mol/L. What is the value of the equilibrium constant?6. For the reaction: 3A(g) + 2B(g) ↔ 3 C(g) Kc = 0.0245At equilibrium, the system contains [A] = 0.075 M and [B] = 0.115 M. What is theconcentration of C at equilibrium (in M)?7. Given the reaction A(g) + 3B(g) ↔ 2 C(g) Kc = ???Initially, only 0.200 M of C(g) is present. At equilibrium, 0.050 M of A is present. What isthe value of the equilibrium constant?

At equilibrium, the concentrations in this system were found to be [N,] = [O,] = 0.200 M and [NO] = 0.500 M. N2(g) + O2(g) = 2 NO(g) If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established? [NO]inal M

5.For the following equilibrium reaction:   Energy + 2AB2 (g)                   2 AB (g)  +  B2 (g)   where K = 55   What will happen to the amount of B2 (increase, decrease or stay the same) if   a catalyst is added   some AB is removed   temperature is increased   pressure is increased   the amounts of AB2 and AB are kept constant while the value of K is decreased