One liter of a mixture of \( \mathrm{O}_{2} \) and \( \mathrm{O}_{3} \) at NTP were allowed to r...

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One liter of a mixture of \( \mathrm{O}_{2} \) and \( \mathrm{O}_{3} \) at NTP were allowed to react with an excess of acidified solution of \( K \mathbf{I} \). The iodine liberated required \( 40 \mathrm{~mL} \) of \( M / 10 \) sodium thiosulphate solution for titration. Knowing that ultraviolet radiations of wavelength \( 300 \mathrm{~nm} \) can decompose ozone and assuming that one photon can decompose one molecule of ozone, what is the number of photons required for the complete decomposition of ozone in the original mixture?
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