The molar entropy is maximum for

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(C) Entropy is a measure of the randomness or disorder of a system. For a given substance,the entropy follows the order: $S_{gas} > S_{liquid} > S_{so

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$H_2O\, (g, 100\ ^\circ C, 1\ atm)$

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(C) Entropy is a measure of the randomness or disorder of a system. For a given substance,the entropy follows the order: $S_{gas} > S_{liquid} > S_{solid}$. Additionally,entropy increases with an increase in temperature. Comparing the options: $A$ and $B$ are solid and liquid at $0\ ^\circ C$,which have lower entropy. $D$ is liquid at $100\ ^\circ C$,which has higher entropy than solid or liquid at $0\ ^\circ C$. $C$ is water vapor (gas) at $100\ ^\circ C$. Since gases have significantly higher entropy than liquids due to the high degree of molecular freedom,$H_2O\, (g, 100\ ^\circ C, 1\ atm)$ has the maximum molar entropy.

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