question_answer 35)

Calculate the entropy change in the surroundings when 1 mole of \[{{H}_{2}}O(l)\] is formed under standard conditions \[{{\Delta }_{f}}{{H}^{{}^\circ }}=-286kJ\,mo{{l}^{-1}}\]  

Answer:

Amount of heat absorbed by the system \[=+286kJ\,mo{{l}^{-1}}\] \[\Delta S=\frac{q}{T}=\frac{286\times 1000}{298}\] \[=959.73J{{K}^{-}}mo{{l}^{-1}}\]