A fuel-oil ( 88% de C y 12% de H2-weight) is burning in a furnace producing a gas which contain CO2,O2,N2 y H2O, with the following composition in dry basis: CO2=13.4%,O2=3.6%,N2=83%(involume) Air and fuel-oil come into the furnace at 25C. The furnace loses for the walls 300000kcal/100 kg of fuel-oil fed. Calculate: e. If a heat exchanger is inserted in the exit furnace for whose outer jacket is circulating water to its boiling point, leaving the exchanger as vapor at 300C, calculate the mass of cooling water required, assuming that the temperature of the gases to the outlet of the exchanger is 300C (is in equilibrium with water vapor at the exit of the exchanger) Information: Specific heats of the combustion gases in kcal/(kmol.C) : CO2=10.2O2=7.3N2=7.0H2O(v)=8.3 Heat of combustion at 25C : C+O2CO2H2+1/2O2H2O(v)HCc=94052kcal/kmolHCc=57800kcal/kmol Enthalpy of vaporization H2OHvap=9720kcal/kmol