Be sure to answer all parts. The equilibrium constant Kc for the reaction H2(g)+Br2(g)2HBr(g) is 2.180106 at 730C. Starting with 1.20 moles of HBr in a 21.9L reaction vessel, calculate the concentrations of H2,Br2, and HBr at equilibrium. [H2]=[Br2]=[HBr]=MMM