100kmol/h of a stream containing 20mol%CO,20mol%H2O, and 60mol%H2 is combined with additional steam and fed to a water-gas shift reactor to produce more hydrogen according to the reaction: CO+H2OCO2+H2 The equilibrium constant of the water-gas shift reaction is 200 , and the mole fraction of hydrogen at the outlet is 0.75 . Write and balance the chemical equation. How much additional steam is fed to the water-gas shift reactor