For an isolated system,$\Delta U = 0,$ what will be $\Delta S?$

One mole of an ideal gas is expanded isothermally and reversibly to half of its initial pressure. $\Delta S$ for the process in $J \ K^{-1} \ mol^{-1}$ is $[\ln \ 2 = 0.693$ and $R = 8.314 \ J \ mol^{-1} \ K^{-1}]$

The enthalpy of vaporization of benzene is $30.779 \ kJ/mol$ and its boiling point is $353 \ K$. Find the change in entropy for the conversion of liquid benzene to its vapour at that temperature.

$A$ boiled egg shows entropy:

The spontaneous flow of heat is always

For the process $H_2O(\ell) \rightarrow H_2O_{(g)}$ at $T = 100^{\circ} C$ and $1 \ atm$ pressure,the correct choice is: