± Calculating Equilibrium Constants 21 of 56 미 AZd The equilibrium constant, K, of a reaction at a particular temperature is determined by the concentrations or pressures of the reactants and products at equilibrium. Submit For a gaseous reaction with the general form the Ke and Kp expressions are given by iving concentrations from data Deri In Part A, you were given the equilibrium pressures, which could be plugged directly into the formula for K.In Part B however, you will be given initial concentrations and only one equilibrium concentration. You must use this data to find all three equilibrium concentrations before you can apply the formula for K AT B (PA) (Ps) The subscript c or p indicates whether K is expressed in terms of concentrations or pressures. Equilibrium- constant expressions do not include a term for any pure solids or liquids that may be involved since their composition does not change throughout the reaction. The standard state of a pure substance is the pure substance itself, and although the quantity may change the sample remain pure. The concentration is effectively equal to 1, and will not impact the magnitude of K Part B The following reaction was performed in a sealed vessel at 798 C H2 (g) + 12 (g)-2H1(g) Initially, only H2 and 12 were present at concentrations of H2 = 4.00M and 12-2.35M The equilibrium concentration of 121s 0.0300 M. What is the equilibrium constant, Kc, for the reaction at this temperature? Express your answer numerically. View Available Hint(s) � Submit