Entropy will increase by 0.693 times.
What is isothermal process?
The temperature of the system is constant (T = const) during an isothermal process, which is a thermodynamic process. In order to maintain constant temperature control with the reservoir through heat exchange, the heat transfer into or out of the system normally needs to occur at such a slow rate. The thermal equilibrium is preserved in each of these states.
ΔS=nRln (V1/V2)
if V1=2V2 then it will become nR2ln.
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