Explain what is the maximum amount of work

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A 11.2 L vessel at 20. oC contains butane, C4H10(g), at a pressure of 2.70 atm. What is the maximum amount of work that can be obtained by the combustion of this butane if the gas is first brought to a pressure of 1.00 atm and the temperature is brought to 25 oC? Assume the products are also returned to the same temperature and pressure.

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