Calculate total entropy change when $NaCl$ dissolves in water under standard conditions:
$NaCl_{(s)} \longrightarrow Na^+_{(aq)} + Cl^-_{(aq)}$
$S^{\circ}(NaCl) = 72.1\text{ J/mol/K}, S^{\circ}(Na^+) = 321\text{ J/mol/K}, S^{\circ}(Cl^-) = 56.5\text{ J/mol/K}$