Ethanol is manufactured by the vapour-phase hydration of ethylene to ethanol  according to the reaction: )( )( g + 2)(42 → HCgOHHC 52 OH g Assuming that the reaction mixture behaves like an ideal gas, calculate the extent of  the reaction and the equilibrium composition for an initial steam-to-ethylene ratio of 5  if the reaction occurs at 250°C and 35 bars.  Cp is given by the equation: ( ) 2 −2 Cp AR CTBT +++= DT .  Use Table C1 and Table C4 to calculate the equilibrium constant at 250°C