Two parts of molecular hydrogen gas are mixed with one part of molecular oxygen gas (on a molar basis) at 2.00 MPa, 0.00°C and expanded through a reversible nozzle from a negligible inlet velocity to 292 m/s at the entrance to the combustion zone of a rocket engine.
Through a preheating process in the nozzle, the gas mixture receives 1325.5 kJ per kg of mixture of heat at 500.°C. Determine the exit pressure of the gas mixture. Assume ideal gas behavior.