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Fuel and gas are mixed in a cyclinder with a piston. Original volume is 0.31L. When...

Fuel and gas are mixed in a cyclinder with a piston. Original volume is 0.31L. When the mixtured gas is burned, producing gas and 815J. If all the energy generated is used to move the piston. what will be the final volume if the cyclinder under the constant pressure of 635mmHg?
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