In a sulphuric acid plant, the secondary converter is a tray type converter, 2.3 m in diameter with the catalyst arranged in 0.45 m thick. the catalyst is in the form of cylindrical pellets 9.5 mm in diameter and 9.5 mm long. the void fraction is 0.35. the gas enters the converter at 675 k and i atm. its inlet composition is: so3 6.6, s02 1.7, 02 10.0, n2 81.7 mol%. the gas flow rate is 0.68 kg/m2 s. calculate the pressure drop through the converter. (gas viscosity- 0.032x 1 10 pa s)