Afuel oil is burned with air in a boiler furnace. the combustion produces 813 kw of thermal energy of which 65z5 is transferred as heat to the boiler tubes that pass through the furnace. the combustion products pass from the furnace to a stack at 650 deg c. liquid water enters the boiler tubes at 20 deg c and leaves the tubes as saturated steam at 20 bar absolute. (a) calculate the rate (kg/sec) at which steam is produced. (b) estimate the volumetric flow rate of steam produced (m^3/sec) using the steam tables. (c) repeat part (b) using the ideal gas law. which result would you trust more, and why? (d) what happened to the 35% of the combustion energy that did not get transferred to the boiler tubes?