A gas is cooled and loses 50 J of heat. The gas contracts as it cools and work done on the system equal to 20 J is exchanged with the surroundings. Hence, ∆E is

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70 J

-30 J

30 J

-70 J

answer is B.

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Detailed Solution

System loses heat, hence q = - 50 JAlso, gas contracts due to cooling, hence W = 20 J∴ΔE=q+W=−50+20=−30J

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