A gas expands and does P-V work on the surroundings equal to 325 J. At the same time, it absorbs 127 J of heat from the surroundings. Calculate the change in energy of the gasAn expansion implies an increase in volume, therefore w must be 325 J (see the defining equation for pressure-volume work.) If the system absorbs heat, q must be 127 J. The change in energy (internal energy) is:
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