Nitrosyl bromide, NOBr, is formed in the reaction of nitric oxide, NO, with bromine,Br2 : 2NO(g)+Br(g)<---->2NOBr(g) The reaction rapidly establishes equilibrium when the reactants are mixed. At a certain temperature the concentration of was 0.400M and that of Br2 was 0.255M . At equilibrium the concentration of NOBr was found to be 0.250M . What is the value of Kc at this temperature?