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?A body of ideal gas exists at a certain temperature, pressure, and volume, inside of a...

?A body of ideal gas exists at a certain temperature, pressure, and volume, inside of a friction-less, mass-less piston, inside of an arbitrarily large water bath at 25 degree C. Weights are placed on the piston to increase the pressure on the gas. How does this affect a) the internal energy and b) the enthalpy of the gas?

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