Atomic StructureHard

Question

Photo dissociation of water H2O(l) + hv → H2(g) + ½O2(g) has been suggested as a source of hydrogen. The heat absorbed in this reaction is 289.5 kJ/mole of water decomposed. The maximum wavelength that would provide the necessary energy assuming that one photon causes the dissociation of one water molecule is (1 eV = 96.5 kJ/mol)

Options

A.413.33 nm
B.826.67 nm
C.206.67 nm
D.4.3 nm

Solution

$\lambda \approx \frac{1240}{\left( \frac{289.5}{96.5} \right)} = 413.33\text{ nm}$

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