Here the temperature is constant, and we know that the internal energy is Function of temperature hence the change in internal energy will be zero.(dU=0)
From 1st law of thermodynamics,
dQ= dU + PdV
dQ= work done.
And entropy is defined as dQ/T= S, T=45 °C=318.15K
So S= 575/318.15
S= 1.8073 J/K is the answer.
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