1. The problem statement, all variables and given/known data A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8) and 15% butene (C4H8) by volume. It is to be fed to the combustion chamber in 10% excess air at 25°C, where it is completely burnt to carbon dioxide and water. The flue gases produced are to be used to generate 5 bar steam from water at 90°C. Determine the maximum flame temperature ?. 2. Relevant equations heat input to process = heat out of process Heat out of process = ∑ (mass × mean specific heat capacity × TF ) for each product of combustion 3. The attempt at a solution 2581 Kj 1987°C This answer is incorrect. Any help is much appreciated.