Calculate the entropy change in surrounding when 1.00 mol of H2O(l) is formed under standard condition △fH⊖=−286KJmol−1.
Formation of water under standard conditions is an exothermic process. During the process heated is given out by the system to surrounding. Hence,
qsurr+286kJ/mol
The expression for the entropy change is ΔS=qt
Substitute values in the above expression,
ΔS=286×1000298=959.7J/K/mol.