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a balloon filled with 39.1 mol helium has a volume of 876 L at 0.0 degrees C and 1.00 atm pressure. the temperature of the balloon is increased to 38.0 degrees C as it expands to a volume of 998 L, the pressure remaining constant. calculate q, w, and change in enthalpy for the helium in the balloon. (the molar heat capacity for helium gas is 28.8 J/ degrees C mol.)

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