Having trouble sorting out variables and maybe units, too, on this one:

Gas and air vapor in a cylynder w/piston. Original volume is 40cc. Combustion releases 950 J. If pressure is constant at 650 torr, to what volume will gasses expand (assuming all E of combustion pushes piston). I'll attach what I think the setup is.

Question

Having trouble sorting out variables and maybe units, too, on this one: 

Gas and air vapor in a cylynder w/piston.  Original volume is 40cc. Combustion releases 950 J. If pressure is constant at 650 torr, to what volume will gasses expand (assuming all E of combustion pushes piston). I'll attach what I think the setup is.

anonymous · Answer

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I want to write E = q - P(change in volume), but I'm pretty sure that isn't right.