One litre of a mixture of O_(2) and O_(3) at NTP was allowed to react with an excess of acidified solution of KI. The iodine liberated required 40 mL of M/10 sodium thiosulphate solution for titration. Knowing that ultraviolet radiation of wavelength 300 nm can decompose ozone and assuming that onw photon can decompose one molecule of ozone, the number of photons required for the complete decomposition of ozone in the original mixture will be

One litre of a mixture of O_(2) and O_(3) at NTP was allowed to react

1.	One litre of a mixture of O_(2) and O_(3) at NTP was allowed to react with an excess of acidified solution of KI. The iodine liberated required 40 mL of M/10 sodium thiosulphate solution for titration. Knowing that ultraviolet radiation of wavelength 300 nm can decompose ozone and assuming that onw photon can decompose one molecule of ozone, the number of photons required for the complete decomposition of ozone in the original mixture will be
Answer» `1.20xx10^(21)` `1.20xx10^(20)` `1.20xx10^(22)` `1.20xx10^(23)` Solution :No. of moleculaes in `2XX10^(-3)` mole of `O_(3)` `=2xx10^(-3)xx6.022xx10^(23)=1.2044x10^(21)` `:.` No. of photons REQUIRED `=1.2044xx10^(21)`.