A combustion chamber is design for thermal oxidation of waste gas containing Benzene. Given that frequency factor is 7.431021s1, the activation energy of oxidation reaction of Benzene is 401kJ/mol, and the ideal gas constant is 8.314J/molK. The design temperature is 750C, the waste gas flow velocity is 7.5m/s. Determine the length of combustion chamber for achieving a removal rate of 99.8%. (10 marks)