Calculate the entropy change in surroundings when 1.00 mol of H2O( l ) is formed under standard conditions. ΔfHθ = 286 kJ mol1.

Formation of H2O(l) is an exothermic process.So, ΔH= -286 kJ/mol

Therefore, heat is transferred to the surroundings.

Thus, qsurr = +286 kJ/mol

Now, ΔS = q/t

 = (286 x 1000) / 298  

 = 959 JK-1mol-1

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