Octane gas C8H18 at 25C enters a jet engine and burns

Chapter 13, Problem 13.54

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Octane gas \(\mathrm{C}_{8} \mathrm{H}_{18}\) at \(25^{\circ} \mathrm{C}\) enters a jet engine and burns completely with 300% of theoretical air entering at \(25^{\circ} \mathrm{C}\), 1 atm with a volumetric flow rate of \(42 \mathrm{~m}^{3} / \mathrm{s}\). Products of combustion exit at 990 K, 1 atm. If the fuel and air enter with negligible velocities, determine the velocity of the exiting combustion products, in m/s. Neglect heat transfer between the engine and its surroundings.

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