Chemistry

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Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 70. cm3. If the combustion of this mixture releases 930. J of energy, to what volume will the gases expand against a constant pressure of 670. torr if all the energy of combustion is converted into work to push back the piston?

I try to use the Work = =P * Delta V with Delta E = q +w But I end up with two variables. And I am to confused as to what 930 J Stands for as it says energy, not heat so i pluged it in for Delta E.

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