In the photochemical decomposition of ethylene iodide, C2H4I2 + hv --> C2H4 + I2, with radiation of 4240 Å, the iodine formed after 20 minutes required 41.14 mL of 0.0050 N sodium thiosulfate solution. The intensity of the light source was 9.15 erg/sec. Calculate the quantum yield assuming absorption of the energy was complete

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