it said I was incorrect, and this was the answer given by an expert. please help, I don't understand this one

Consider the equilibrium system described by the chemical reaction below. At equilibrium, a 3.0L reaction vessel contained a mixture of 1.37102MHI,6.47103MH2 and 5.94104Ml2 at 740K. What are the values of Kc and Kp for the reaction at this temperature? H2(g)+I2(g)2HI(g) 2 NEXT > Based on the given data, set up the expression for Kc. Each reaction participant must be represented by one tile. Do not combine terms. Once the expression is constructed, solve for Kc. Complete Parts 1-2 before submitting your answer. Kc==