When an ideal gas in a cylinder was compreswsed isothermally by a piston, the work done on the gas found to be `1.5xx10^(4)` cal. During this process about

Options

A. `3.6xx10^3 cal` of heat flowed out from the gas
B. `3.6xx10^3 cal` of heat flowed into the gas
C. `1.5xx10^4` cal of heat flowed into the gas
D. `1.5xx10^4` cal of heat flowed out from the gas

Answer

A

Explanation

In isothermal process, `DeltaQ=DeltaW`
`DeltaQ=DeltaW=-1.5xx10^4J=(-15xx10^4)/(4.2)=-3.6xx10^3cal`
`DeltaQ` is `-ve` i.e., heat is rejected by the gas.