If heat is supplied to an ideal gas in an isothermal process, _____________ .

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the gas will do positive work Internal energy of the gas, U=intC_vdT Here, Cv is the specific heat at constant volume and dT is the change in temperature. If the process is isothermal, i.e. dT = 0, dU = 0. Using the first law of thermodynamics, we get ΔQ = ΔU + ΔW But ΔU = 0 $\Rightarrow$ ΔQ = +ΔW Here, ΔW is the positive work done by the gas.

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