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A sample consisting of 1.8 grams of water vapor has a volume of 1.5 L at...

A sample consisting of 1.8 grams of water vapor has a volume of 1.5 L at 320.0K. It is then allowed to expand reversibly and adiabatically to a final volume of 3.0 L. Calculate the final pressure if  = 1.4.

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