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Question
A gas is cooled and loses 65 J of heat. The gas contracts as it cools and the work done on the system is equal to 20 J. What is △U?
A gas is cooled and loses 65 J of heat. The gas contracts as it cools and the work done on the system is equal to 20 J. What is △U?
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Solution
The correct option is A −45 J
From the first law of thermodynamics,
△U=Q+W
where, Q is the heat transfer and W is the work done in the process.
Q=−65J, W=20 J
△U=−65+20=−45 J
From the first law of thermodynamics,
△U=Q+W
where, Q is the heat transfer and W is the work done in the process.
Q=−65J, W=20 J
△U=−65+20=−45 J
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