Photodissociation of water

has been suggested as a source of hydrogen. The ΔH°rxn for the reaction, calculated from thermochemical data, is 285.8 kJ per mole of water decomposed. Calculate the maximum wavelength (in nm) that would provide the necessary energy. In principle, is it feasible to use sunlight as a source of energy for this process?

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H2O(l) + hv → H2(g) + 40,(g)