Electrons are ejected from sodium metal by any light that has a wavelength shorter than 544 nm. what is the kinetic energy of an electron (in j) that is ejected from sodium by light with a wavelength of 485 nm?

In a particular chemical reaction, the energy of the reactants is 30 kj and the energy of the products is 5 kj. 
 the maximum energy of the system is 40 kj. sketch a potential energy diagram for this reaction. make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.