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NCERT Class XI Chemistry Thermodynamics Solutions

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Question : 22 of 22
Marks: +1, -0
Calculate the entropy change in surroundings when 1.00 mol of H2O(l) is formed under standard conditions.
ΔfH° = – 286 kJmol–1.
Solution:  
ΔfH°[H2O(l)] = – 286 kJmol–1
∴ qsurroundings = + 286 kJ/mol
ΔS(surr) =
q
298
 =
286×1000
298
 JK−1mol−1 = 959.73 JK−1mol−1
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