The hydrogen-line emission spectrum includes a line at a wavelength of 434 nm. what is the energy of this radiation? (h= 6.626 x 10 ⁻³⁴ j * 8 ) show work

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?