[billy maize]

Consider a mixture of air and gas in a cylinder with a piston. The original volume is 40cm^3. If the combustion of this mixturereleases 950J of energy, to what volume will the gases expand against a constant pressure of 650torr if all the energy of combustion is converted into work to push back the piston?

[MrTeo]

It's quite easy to do... what's the expression for the work done in an isobaric process? (if you don't know check on your textbook or here: http://en.wikipedia.org/wiki/Isobaric_process)