chemi chemi chho!!!!!!!!!!!!!

One litre of a mixture of oxygen gas and ozone 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. Weight percent of ozone in the mixture is 'a'. Ultraviolet radiation of wavelength 300 nm can decompose ozone. Assuming that on photon can decompose one ozone molecule, photons required for the complete decomposition of ozone in the original mixture is 'b × 10^n'. (a+b\n-1)= m Find 100000m.