Chapter 7, Problem 9P

A rocket engine burns 8.5kg of fuel and oxidizer per second, and combinations gases exit the rocket at a velocity of 565m/s relative to the rocket, at a pressure approximately equal to the surrounding atmospheric pressure. Find the thrust produced by the rocket engine.

The change in internal energy for the combustion of 1.0 mol of octane at a pressure of 1.0 atm is -5084.3 kJ . If the change in enthalpy is -5074.0 kJ , how much work is done during the combustion?         Express the work in kilojoules to three significant figures.