Question: air is heated from 25c to 150c prior to entering...

Air is heated from 25°C to 150°C prior to entering a combustion furnace. The change in specific enthalpy associated with transition is 3900 J/mol. The flow rate of air at the heater outlet is 45.8 mol/min and the air pressure at this point is 122Kpa absolute. Calculate the heat requirement in J/s.