Consider the following system at equilibrium where ??• = - 87.9 kJ and Kc = 83.3, at 500. K. PC13 (g) + Cl2 (g) - PC15 (g) If the VOLUME of the equilibrium system is suddenly increased at constant temperature: The value of Kc ??increases ??decreases ??remains the same The value of Qc O is greater than Kc Ois equal to Kc O is less than Kc The reaction must O run in the forward direction to reestablish equilibrium. O run in the reverse direction to reestablish equilibrium. O remain the same. It is already at equilibrium. The number of moles of Cl2 will ??increase ??decrease ??remain the same Show