When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be 1.5×104 joules. During this process about

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3.6×103cal of heat flowed out from the gas

3.6×103cal of heat flowed into the gas

1.5×104cal of heat flowed into the gas

1.5×104cal of heat flowed out from the gas

answer is A.

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Detailed Solution

In isothermal compression, there is always an increase of heat. which must flow out the gas.ΔQ=ΔU+ΔW⇒ΔQ=ΔW (∵ΔU=0)⇒ΔQ=−1.5×104J=1.5×104418cal=−3.6×103cal

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