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The gas sample in the cylinder is supplied with 524 kJ of energy, so this is added energy. A piston compressing the gas is also added energy to the system. Therefore you must add both the energy changes given, resulting with an internal energy change of 864 kJ.
005384106 wrote:will we ever need to do any conversions for units? do these problems always need to be in kJ?
I assume that you will need to do unit conversions on the test to get the answer right. Its always easier to use the units that are in the questions.
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