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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a
70 J
b
-30 J
c
30 J
d
-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
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