The activation energy of a first order reaction at 300k is 60kj/mol. In the presence of a catalyst, the activation energy gets lowered to 50kj/mol at 300k. how many times the reaction rate changes in the presence of catalyst at the same temperature. 0.01 m aquous solution of Na2SO4 depreses the freezing point of water by 0.0284 c. Calculate the degree of dissociation and dissociation constant of the salt.