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The following calculations are made on a uranyl oxalate actinometer, on the assumption that the energy of all wavelengths between 254 and 435  nm is completely absorbed. The actinometer contains 20  cm^3 of 0.05  mol  L ^-1 oxalic acid, which also is 0.01  mol  L^-1 with respect to uranyl sulfate. After 2  h of exposure to ultraviolet light, the solution required 34  cm^3 of potassium permanganate, KMnO4, solution to titrate the undecomposed oxalic acid. The same volume, 20  cm^3, of unilluminat
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