**Butane (C4H10) is fed to a fired heater at a molar flow rate of 100 mol/h and 50% excess air.Fifty percent of the butane is consumed, and the product gas contains 9 mol CO2 per molCO. Calculate the molar flow rate of water in the stack gas.**

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Fifty percent of the butane is consumed, and the product gas contains 9 mol CO2 per mol

CO. Calculate the molar flow rate of water in the stack gas.