Perform an atomic material balance to calculate with the corresponding atomic and molecular weights the mass base % of C and H.

Consider the following information for a boiler that uses natural gas as fuel: Steam discharged by the boiler: 75,000 kg/h Discharged steam temperature and pressure: 350C, 35 bar (absolute pressure) Temperature and pressure of the supplied water: 110C, 40 bar (absolute pressure) Fuel used (natural gas): 4,750 kg/h @ 25C (HHV: 55,528 kJ/kg). Assume natural gas is 100% methane (CH4). Combustion gas temperature in the last recuperator: 180C Dry bulb temperature of supplied combustion air: 32C Relative humidity of supplied combustion air: 65% Barometric pressure (absolute) at the test site: 1 atm

Combustion gas analysis (dry basis): 81.9% N2, 13.0% CO2, 0.1% CO, 5% O2.