You have a 100. ml of a 0.25 M K2SO4 stock solution, You want to create a 0.10 M solution you would have to add water until what new volume would be reached?

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?