A fuel gas consisting of 94 mole-% methane and 6 mole-% nitrogen is burned with 35% excess air in a continuous water heater. Both fuel gas and air enter dry at 298.15 K(2SoC). Water is heated at a rate of 34.0kg s^-l from 298.15 K(2S°C) to 368.15 K(9S°C). The flue gases leave the heater at 483.15 K(210°C). Of the entering methane, 70% burns to carbon dioxide and 30% burns to carbon monoxide. What volumetric flow rate of fuel gas is required if there are no heat losses to the surroundings?