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Calculating adiabatic flame temperature

Calculate the adiabatic flame temperature of acetylenes gas at a pressure of 1 bar under the following conditions. The reactants are initially at 298K. Assume that the acetylene reacts completely to form CO2 and H2O:

a. It is combusted in a stoichiometric mixture of O2.
b. It is combusted in a stoichiometric mixture of air.
c. It is combusted with twice the amount of air as needed stoichiometrically.

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