Combustion of a rocket engine involves the reaction between hydrogen and oxygen. This releases 242 kJ of heat into the environment. If the initial energy was 17 kJ and the final energy was 494 kJ, how much work was done? Was this work done to or by the system? Be sure to show all of your work and include the correct units.

Combustion of a rocket engine involves the reaction between hydrogen and oxygen. This releases 242 kJ of heat into the environment. If the initial energy was 17 kJ and the final energy was 494 kJ, how much work was done? Was this work done to or by the system? Be sure to show all of your work and include the correct units.