At a certain temperature, the equilibrium constant, K c , for this reaction is 53.3. H 2 ( g ) + I 2 ( g ) − ⇀ ↽ − 2 HI ( g ) K c = 53.3 At this temperature, 0.300 mol H 2 and 0.300 mol I 2 were placed in a 1.00 L container to react. What concentration of HI is present at equilibrium?